v072010 - Who-sells-it.com

v072010

Mission Statement 2 

OD6: Overdrive 6-Speed 3 

Right Side Drive 4 

RT250 aka Mr.Potato Head 5 

Baker Drive Brake & Bonneville 3-Speed 6 

SBD:Softail Belt Drive 7 

FFP: Function Formed Primary 8 

TorqueBox 9 

PowerBox 10 

Sprockets & Pulleys 11 

Drivetrain Options 12 

Baker Clutches 13 

XL Products 15 

Big Dog Products 16 

Baker Online 17 

Baker Apparel and Spectro Oils 18 

BAKER’s Unbeatable Warranty: 

Let’s face it: when you are buying a top-of-the-line transmission, primary, or clutch you expect the best. You want to go the distance with 

years of trouble free service. The BAKER R&D department rigorously validates each and every BAKER Drivetrain product to guarantee 

customer satisfaction within our warranty periods. Because of the work we do in advance and our ongoing quality control measures, it 

is rare that customers have problems with our products. That’s why BAKER Drivetrain offers one of the best warranties in the business. 

Complete transmissions and gearsets carry a 5 year 50,000 mile warranty. Clutches, primaries, and ancillary parts carry a 2 year 20,000 

mile warranty. 

This is the way it should be. We guarantee that when you buy BAKER you buy premium, American-made top of the line innovations - but 

we can also guarantee that we are going to stand by that product with unbeatable service for the long haul. 

There’s something to be said these days for an American-made product with that kind of support. Our factory is just outside of Detroit, the 

Motor City, in Michigan. We’re part of the every day grind just like you are. Each BAKER product is built to order when you order it, with 

all parts made right here in the USA, by guys who know their shit about gearboxes inside and out. 

We are the Drivetrain Authority: often imitated (by communist China slopes), never duplicated. We’ve changed the face of the Harley 

aftermarket with our original overdrive 6-speed (OD6), Right Side Drive (RSD), DD6, DD7, N1 drums, FF primaries, reverse kits, and the 

KKK clutch. Evolving and improving the iconic Harley Davidson ® motorcycle is our business and we are really friggin’ good at it. 

What does this give you? Peace of mind. Every time you push that button or climb on that kicker - you know there is a strong, dependable 

drivetrain ready to go and that BAKER is right beside you every mile along the way. 

Go ahead, give BAKER a call today and talk to one of our Sales/Tech professionals... We can promise you clear, English-speaking, tech 

savvy people on our end of the line. Guys who ride and appreciate your bike like you do. 

9804 E. Saginaw, Haslett, MI 48840 

Phone (517) 339-3835, Fax (517) 339-4590, Toll Free (877) 640-2004 

info@bakerdrivetrain.com 

All prices in this book subject to change. 

We have no relationship with any of the Asian knock-off artists that copy our products and pollute our great country with inferior gears and shafts made from steel alloys that would be more 

appropriate for the manufacturing of soup cans. Any mention of other manufactures is for reference only. Mr.PotatoHead, JIMS, S&S, RevTech, Big Dog, are all trademarks of their respective 

entities. BAKER Drivetrain and BAKER Inc. are not associated with the Harley-Davidson Motor Company. Sportster, Buell, Softail, Dyna, Road King, Ultra Classic, FXR, FLT, FLST, FLSTC, 

FLSTF, FLSTFI, FLSTCI, FLH, FLTR, FLTRI, FLTCUI, FLHTC, FLHR, FLHRI, FLHRC, FXRS, FXRT, FXR2, FXR3, FXRSP, FXD, FXDL, FXDT, FXDLI, FXDXI, Shovelhead, Panhead, 

Knucklehead, Evo, Evolution, Twin Cam, Screamin’ Eagle, FLH, Cruise Drive, Harley, H-D, Harley-Davidson and anything else we may have missed in this disclaimer that Harley-Davidson says 

they own unless they are BAKER Drivetrain trademarks listed below are all trademarks of the Harley-Davidson Motor Company. BAKER Drivetrain, BAKER Six-Speed Overdrive, Function- 

Formed, OD6, DD6, DD5, DSSC, Torquebox, 6-into-4, BAKER Billet Series,XL6, BAKER KKK, King Kong Klutch, Klassic Kicker Gears,BAKER 300, F6F, PowerBox, DD7, Street Performance 

Clutch, FFP, FFPS,Synchronous Belt Drive, Drivetrain Authority and BAKER are trademarks of BAKER Inc., Haslett, Michigan. 

1

The older pilots refer to it as the Sound of Round. That’s the beautiful mechanical cacophony you hear from an 

airplane with a Pratt & Whitney R-985 when its crawling through sky. That 985 cubic inch 9-cylinder radial makes a 

sound that can’t be duplicated or imitated. Same goes for a Harley engine. A big displacement 45° V-twin with high 

compression and a really nervous camshaft with lots of valve overlap sounds better than every girl in a strip club 

simultaneously screaming your name. 

At BAKER Drivetrain we are gear-heads and motor-heads; we love this shit. But we don’t make motors; we make 

drivetrains and they often take a back seat to the iconic presence of the motor. The Custom and Performance catalog 

is proof that we won’t let the drivetrain be overlooked. It’s importance as the caretaker of delivering that juicy V-twin 

torque to the rear tire cannot be emphasized enough. 

So you have some torque. The OD6 and PowerBox will handle 165 ft-lbs of torque. Both have a common gearset 

but the PowerBox borrows heavily gusseted architecture from Satan’s transmission, the TorqueBox which begs for 

250 ft-lbs of torque. The Function Formed Primary (FFP) has that classic belt drive look but it’s enclosed wet design 

has a through-hole in the middle and is ready for mid control fabrication. And don’t forget the clutch, it is surrounded 

by two bullies; the torque from the motor and the rear tire/pavement but the KKK clutch was born from a Cadillac 

transmission, grew up in Detroit, and can kick anybody’s ass. And there’s more unique drivetrain components that are 

only available in the catalog you are holding right now, so please check it out. 

This company was started 12 years ago because motors were making more and more power, but nobody was taking 

the drivetrain seriously. Make sure to choose the right drivetrain, chassis, and rear wheel to put the power to the 

ground. 

The components we offer for the Harley Davidson® drivetrain aftermarket are now broken up into 4 catalogs: Cruise 

Drive era (2007-later), 5-speed era (1984-2006), 4-speed era (1936-86), and Custom/Performance (includes Big Dog 

and Sportster/Buell). All four catalogs are available in hard copy or can be downloaded from our website. Each catalog 

is technically informative, includes some reference pricing, and should provide the information necessary to improve the 

performance of your American V-Twin. If, after reading this catalog, you still have questions then give our experienced 

tech or sales staff a call at (877) 640-2004 or send an Email to info@bakerdrivetrain.com. 

Photo courtesy of Steve Berner 

2

Available as a builder’s kit or complete transmission assembly for the following 

applications: 

PN DESCRIPTION FITMENT 

T401 Builder’s Kit, 2.94 1st, Tapered Shaft 1985-89 FL, Softail, 

T401S Builder’s Kit, 2.94 1st, Tapered Shaft 1985-89 FXR 

T701 Complete Build, 2.94 1st, Tapered Shaft 1985-89 Softail 

T702 Complete Build, 2.94 1st, Tapered Shaft 1985-89 FL, FXR 

401 Builder’s Kit, 2.94 1st 90-92 FL, 90-97 Softail, 

90-94 FXR, 91-97 Dyna 

401S Builder’s Kit, 2.94 1st 99 FXR, 98 Dyna, 98-99 

Softail 

401SP Builder’s Kit, 2.94 1st 1999-00 Dyna 

401P Builder’s Kit, 2.94 1st 2000-06 Softail, 2001-05 

Dyna 

402 Builder’s Kit, 2.94 1st 1993-97 FL 

402S Builder’s Kit, 2.94 1st 1998 FL 

404SP Builder’s Kit, 2.94 1st 1999-00 FL 

404P Builder’s Kit, 2.94 1st 2001 FL 

404P2 Builder’s Kit, 2.94 1st 2002-06 FL 

701 Complete Build, 2.94 1st 1990-97 Softail 

702 Complete Build, 2.94 1st 1990-02 FL 

703 Complete Build, 2.94 1st 1991-97 Dyna 



803 Complete Build, 2.94 1st 1998 Dyna 

804 Complete Build, 2.94 1st 1998 FL 


902 Complete Build, 2.94 1st 1999 FXR 




004 Complete Build, 2.94 1st 2001 FL 


the original 6-speed transmission 

This is the ORIGINAL 6-speed design that revolutionized the American V-Twin 

industry. Yet, it’s still the best overdrive 6-speed built to this day...hands down. 

Our OD6 is built to comfortably handle the power from todays big-inch motors. 

This transmission is rated for motors putting out up to 165ft/lbs of continuous use. 

It is available as a complete transmission with a wide variety of case options and 

configurations, or as a builder’s kit for your stock case application, which requires little 

to no modification. The BAKER OD6 is available with many optional gear ratios to 

match your engine torque and riding style. 

Certain 94 and newer models require use 

2-6C door (with 

exhaust bracket 

mount ear) shown 

OPTIONAL OD6 

STANDARD DOOR 

CONFIGURATIONS: 

1) Ear Type (all finishes) 

2) Carlini-type 

3) Merch-type 

4) 1984-86 type 

5) No Ear (all finishes) 

OPTIONAL CASE 

FINISHES: 

1) Wrinkle Black 

2) Polished 

3) Raw 

4) Chrome (on Evo 

Billet cases only) 

Available No Cost 

Options: 

- N-1 Shift Drum 

- Reverse Pattern Shift Drum 

Available Upgrade 

Options: 

- Complete build transmission 

- Front or Rear Feed Hydrualic 

Side Cover 

- +1 Oil Pans 

- BAKER Clutches 

MSRP $40 

of separately purchased BAKER re-cal box 

PN 95E-56 for correct electronic speedo 

operation. 

MSRP $135 

TOP GEAR RPM: 

5-SPEED VS. OD6 

MPH 5-speed OD6 

In 5th In 6th 

65 2945 2533 

70 3172 2723 

75 3398 2923 

80 3625 3118 

Calculated data based on a 24/37 

primary, a 32/70 secondary, and 

a 25” rear tire. 

STANDARD RATIOS 

2.94, 2.21, 1.60, 1.23, 1.00, .86 

OPTIONAL RATIOS: 

1st gear: 3.24 & 2.82(R) 

2nd gear: 2.08(R) 

6th gear: .80 (deep overdrive) 

FUNCTION-FORMED OD6 TRAP 

DOOR AND ACTUATOR END COVER 

AVAILABLE FOR UPGRADE! 

Polished 

FF oil 

spout 

included 

in FL kits 

and complete 

builds 

MSRP 

starting at 

$2395 

3 

We highly recommend 

installing the separately 

purchased high torque 

bearing kit, 

BAKER PN 189-56 

FUNCTION FORMED OPTION: 

- Available upgrade on Builder’s Kit or complete assembly 

- Hydraulic or mechanical for BAKER LSD OD6’s only. 

- Narrower, sleek, FF design 

- Cleaner design; no fill plug or dipstick to clutter the look 

- Available black anodized, polished or chrome 

- Door PN: 490-6 

- Mechanical Cover PN: 491-6 

- Hydraulic Cover PN: 492-6 

- Designed to fit all BAKER Softail, Dyna, and FXR doors. Will fit 

stock FL case. 

- Will work with all stock and aftermarket wet primaries. As well as 

all aftermarket belt drives that fit an OEM 5-speed. 

WITH ALL THE OPTIONS AND THE PROVEN DEPENDABILITY, 

OUR OD6 IS THE PERFORMANCE TUNER’S CHOICE.

We introduced RSD in 2001 when the 240 tires came out as 

a solution to balance big tire customs and it accomplished 

just that. More than ever with the popular 300+ tires and the 

radical 360’s in circulation, RSD translates to zero offset 

and a perfectly balanced radical custom. See below for a 

short course in offset 101. 

AVAILABLE RSD6 GEAR RATIOS 

GEAR 

RATIO 

1ST 

2.82 (‘R’ RATIO) 

or 2.94 

or 3.24 

2ND 

2.08 (‘R’ RATIO) 

or 2.21 

3RD 1.60 

4TH 1.23 

5TH 1.00 

6TH .86 

AVAILABLE RSD5 GEAR RATIOS 

GEAR 

RATIO 

1ST 2.82 (‘R’ RATIO) 

or 2.94 

or 3.24 

2ND 2.08 (‘R’ RATIO) 

or 2.21 

3RD 1.60 

4TH 1.23 

5TH 1.00 

‘R’ ratio 1st and 2nd is available as an option at no cost. For drag racers, an ‘R’ Ratio 

setup means harder launches. For street racers, it gives the stoplight-to-stoplight 

performance advantage. 

Front Wheel 

Heavy 

Big-Inch 

Engine 

Transmission 

Assembly 

Fatter, Wider 

Rear Tire 

OFFSET 101: 

The Evo powered Harley Softail is the 

design basis for custom aftermarket 

components like frames, transmissions, 

and engines. The positional relationships 

between engine and transmission, engine 

and frame, and transmission and frame 

all go back to the Softail. The stock 

Softail from the factory is a well-balanced 

machine with no significant weight bias 

from the left to the right. 

If a wider than stock rear tire is used on 

a Softail, the powertrain (engine and 

transmission) must be moved to the left 

to allow the 1-1/2” wide drive belt to clear 

the left side of the rear tire. Moving the 

powertrain to the left is referred to as 

powertrain offset. 

Powertrain offset can be achieved by 

moving the transmission and/or engine to 

the left, away from the stock position. The 

math to explain this is easy; see the figure 

to the left. The stock H-D Softail has a 130 

size rear tire that is roughly 5.5” wide. The 

300 tire is roughly 12” wide, which means 

there is 3.25 more inches of rubber on 

each side. This means the powertrain has 

to move to the left about 3.25” or so. 

BAKER RIGHT SIDE DRIVE SYSTEMS 

ARE AVAILABLE FOR YOUR CUSTOM 

APPLICATION, SOFTAIL, FLT, FXR, OR 

DYNA (EVO OR TWIN CAM) 

FF Door and Actuator 

optional, see page 12. 

PN 465-6P Door and 

Actuator set shown 

Many choices in 

offset pulleys 

BAKER standard 

hydraulic pulley shroud 

-or- 

BAKER standard 

cable-type rear loader 

pulley shroud 

FLT style RSD door 

-or- 

Dyna style RSD door 

with removable tail section 

No charge upgrade 

RSD6 ignition kill shift drum 

Call a BAKER Tech guy for transmission 

applications and part numbers 

in several 

finish options: 

4

Mr. Potato Head® was conceived in R&D a few years back to study the configurational possibilities of putting universal 

bosses on a featureless tranny case. Just like the Mr. Potato Head® toy, you can end up with a genetic hermaphrodite 

with a little off-the-menu creativity. The universal tranny case accepts an A-flange, B-flange or Evo flange. It also accepts 

all kinds of tail stocks. This exercise yielded the easiest solution 

to offsetting a tranny case side-to-side or up-and-down in 

short production runs. 

The RT250 vision began at Rolling 

Thunder when they divulged plans to 

develop a FL-type Bagger frame that 

was setup for a 250 tire and Softail 

length primary in a balanced RSD 

chassis. They approached us about 

doing a special tranny that was 

specific to this frame. Mr. Potato 

Head® technology finally 

found its first home and we 

named it the RT250 project. 

Left side view shows tail stock 

and front flange removed. PN RT250A-P 

MSRP $3995 

Pn 

Description 

RT250*-P RT250 Transmission assembly, polished 

RT250*-B RT250 Transmission assembly, wrinkle black 

*Specify “A” for A-flange, “B” for B-flange, and “E” for Evo Flange 

Features: 

- Utilizes stock Softail primaries or BAKER FFP 

- Tranny is offset ½” to the left to tuck the drive belt/chain “ 

inside the frame rail 

- No ½” motor sprocket extension required; tranny is slammed 

against the inner primary 

- Tranny mainshaft is ½” shorter than stock 

- Oil bag is separate and below the tranny case for superior 

cooling 

- Frame has +2” in backbone for additional primary length 

- Stock Harley® FL frames converted by Rolling Thunder and 

original VIN retained for no registration hassle 

- Frames accept stock seat, bags, tank, and front end 

Note the following: 

- Tail stock is securely located via two thick walled 

hollow dowels and three 3/8” bolts 

- Front flange is pinned down with seven 5/16 screws and 

two dowels 

- ½” deep relief in starter ear and case shows 

½” left offset 

- Low profile shift lever on tranny case required to 

clear inside of inner primary 

- DD6R gearset with 3.45 1st, 2.56 2nd, 1.87 3rd, 

1.44 4th,1.15 5th, &1.00 6th 

- Low profile hydraulic pulley included with choice of low 

pro 32 pulley or chain sprocket 

- Other pulley covers, including cable type, available 

- TorqueBox inspired detent system for smooth precise shifting 

5 

low-profile pulley cover 

PN RT127-56HC 

MSRP $599 

PN RT292 

MSRP $169 

PN 

RT127-56HC 

RT127-56HP 

RT292 

Description 

RSD pulley cover, chrome, hydraulic Low Pro 

RSD pulley cover, polished, hydraulic Low Pro 

32 tooth low profile pulley, long life steel 

Fitment 

All BAKER RSD except PowerBox, TorqueBox, & Drive Brake 

Low Profile features 

- Designed for 1-1/8” wide belts and smaller 

- FF aesthetics chiseled out of 6061-T6 aluminum 

- Low profile external features for maximum exhaust clearance 

- 1.5” diameter piston included 

- Compatible with H-D® or 11/16” hydraulic master cylinders 

- Must use low profile RT292 pulley or chain sprocket; will not fit 

over standard width pulleys

Drive brake transmissions 

clean up the rear wheel brake related clutter. 

We designed our Drive Brake transmission as a complete system to 

address some concerns we had with bolt on systems. Some bolt on 

systems had small diameter rotors with partial brake pad engagement; 

the one we evaluated wouldn’t even allow us to lock up and skid the rear 

wheel. So we designed our system with an 8” rotor and full pad engagement. 

With a prototype we were able to lock up the rear wheel and throw it sideways. 

Aesthetically, it is super clean with the caliper located in between the belt rungs and 

a minimalistic Function Formed hydraulic actuator spider. 

Features: 

- 8” stainless steel rotor 

- 6061-T6 aluminum clutch actuator spider with 

1.5” diameter piston (hydraulic only). 11/16” 

master cylinder recommended 

- Dual piston brake caliper with PM guts 

- Inboard piston bore is an integral part of the door 

- Polished stainless steel stand-offs under front spider legs 

- Dual brake bleeders; one above each piston 

- Available with show polished or chrome finishes 

- Chrome top cover available with or without neutral switch 

- 29 tooth .5” offset pulley standard 

- N1 drum optional 

- ‘R’ ratio no cost option for big motor applications 

Fits 1990-99 Softail-based and custom Right Side Drive 

Pn 

Description 

R701PB-BRK Show polished Drive Brake transmission assembly w/ standard ratios 

R7211PB-BRK Show polished Drive Brake transmission assembly w/ ‘R’ ratio 

R701CB-BRK Chrome Drive Brake transmission assembly w/ standard ratios 

R7211CB-BRK Chrome Drive Brake transmission assembly w/ ‘R’ ratio 

Gear ratios: 

1st 2.54 

2nd 1.60 

3rd 1.00 

PN R7211PB-BRK 

MSRP $4495 

Standard ratio gears 

1st through 6th: 

2.94, 2.21, 1.60, 1.23, 1.00, .86 

R-Ratio gear ratios 

1st through 6th: 

2.82, 2.08, 1.60, 1.23, 1.00, .86 

The 3-speed cartridge style 

gearset installs into any 

1990-2006 5-speed based 

Big Twin transmission case 

with no modification. 

The Direct Drive 3-speed was developed for 

high horsepower competition applications like 

hill climbing, Bonneville and ¼ mile. 

The special 3-speed shift drum is the N1 type 

with neutral on bottom for a 0-down, 3-up 

shift pattern. The drum has no provision to 

trigger a neutral switch. 

PN 301K 

MSRP $1495 

Countershaft and 3rd gear are cut out of one 

piece of 8620 steel for superior strength over 

a stock 5-speed. Other than the countershaft 

and the special 2.54 ratio 1st gear pair, the 

shafts, and other gears are stock BAKER 

5-speed items. 

6

We’ve been making transmission pulleys for years, both 

aluminum and steel. In short, aluminum pulleys are great for 

racing but do not hold up with miles. Deformed aluminum 

pulley teeth will lead to saggy belts. So we manufacture our 

SBD belt drive with steel pulleys front and rear for those 

who plan on putting on some miles. 

Using steel on the clutch basket pulley also greatly reduced 

the loose bolts rattling sound that is heard on some belt 

drives. Both steel pulleys are plated for corrosion protection. 

Available with zero and ½” offsets for wider rear tire 

applications. 

PN shown SBD-0-NS 

MSRP $2575 

FEATURES: 

- 1.54 pulley ratio with a 28 tooth 

pulley on front and a 43 in the rear 

for a 7% increase in torque to the 

rear wheel on stock Softails from 

1994 to present. 

- Motor plate and edge guard are 

made of 6061-T6 plate stock. Pulley 

caps and dog bone are made of 

6061-T6 forgings. 

- 10 plate clutch 

- 2.4” Wide, 14MM Tooth Proprietary 

Designed Belt 

- Available with or without the 

outside bearing support 

(dog bone), however the dog 

bone configuration is highly 

recommended. 

- Available in show 

polished or black 

anodized finishes 

- 66 tooth ring gear comes with 

matching 9 tooth, one piece 

starter jackshaft riding on a teflon 

impregnated busing. 

SBD belt drives for 1990-2006 softail applications: 

Pn 

DEscription 

SBD-0-S 

No Offset, Outside Support, Polished 

SBD-0-S-BA No Offset, Outside Support, Black Anodized 

SBD-1/2-S 1/2” Offset, Outside Support, Polished 

SBD-1/2-S-BA 1/2” Offset, Outside Support, Black Anodized 

SBD-0-NS No Offset, No Outside Support, Polished 

SBD-0-NS-BA No Offset, No Outside Support, Black Anodized 

SBD-1/2-NS 1/2” Offset, No Outside Support, Polished 

SBD-1/2-NS-BA 1/2” Offset, No Outside Support, Black Anodized 

7

PN 4100-FFP-P 

POLISHED 

MSRP $1995 

The primary drive housing is the most recognizable piece of architecture on 

American motorcycles. It is centrally located and transfers power from the 

engine to the transmission. 

Available in a Black 

Anodized finish. 

FEATURES: 

-6061-T6 forged Inner and Outer 

-1 Piece starter jackshaft for strength 

-Full wet Primary set up 

-Fits stock and custom applications 

PN 4100-FFP-B 

BLACK ANODIZED 

MSRP $2,145 

We sculpted our forged 6061-T6 Function Formed Primary (FFP) to enhance 

the natural mechanical beauty of the elements inside. A SolidWorks 3D model 

of the clutch, chain, starter pinion, and motor sprocket was created and then 

we sparingly started adding material to wrap around those elements. No extra 

aluminum, just mechanical beauty. And there’s a glory hole in the middle for 

that open look, with the benefits of the chain intact. 

FFP fits all Softail models, Evo and Twin Cam without modification. 

Compatible with stock 66-tooth and 102-tooth clutches, compensating 

sprocket, chain, and starter motors. Each primary kit includes an inner primary 

housing, outer primary cover, special starter jackshaft, chain adjustment shoe 

and mechanism, gaskets, and fasteners. 

For performance junkies with mountain motors, the FFP has an optional 

internal outside bearing support (FFPS). Applications above 150 ft-lbs 

require the outside clutch support to keep the transmission mainshaft from 

flexing. The outside bearing support version is the first enclosed, wet primary 

available. Belt drives have been available for years with outside supports. Our 

new KKK clutch is required with outside support spider. See page 13 for 

KKK clutch details. 

The compact design of the FFP dictates the 

following available sprocket/chain combinations: 

Motor Clutch Chain length 

sprocket sprocket (# of pitches) 

21 36 80 

22 35 80 

23 38 82 

24 37 82 

25 36 82 

27 38 84 

28 37 84 

FFP for 1990-2006 softail applications: 

Pn 

Description 

4100-FFP-P Polished (9 tooth jackshaft) 

4100-FFP-B Black Anodized (9 tooth jackshaft) 

4101-FFP-P Polished (10 tooth Jackshaft) 

4101-FFP-B Black Ano (10 tooth Jackshaft) 

8

THE TORQUEBOX has 250 foot pounds of torque load capacity! 

The torque output of an engine is proportional to the bore and stroke. Engines make torque and drivetrain components 

take torque. It is torque, not horsepower that destroys clutches, transmissions, and drive belts. The torque capacity of a 

transmission is proportional to the gear width and the center distance between the two shafts. 

All stock Harley transmissions and aftermarket transmissions have a center distance of 2.5”*. By increasing the center 

distance 20% to 3.0” the Torquebox conservatively increases the torque capacity to 250 ft-lbs, continuous duty! 

In the early Torquebox design stages, the goal was set to design a continuous duty 250 ft-lb gearbox that visually 

looked like a 450 ft-lb gearbox on the outside. We achieved this by taking design cues from classic race-bred American 

superchargers and not having any excess material, anywhere. We achieved our goal. 

The Torquebox is available as a 5 or 6-speed, left or right side drive. The 6-speed is identical to the 5-speed except for the 

addition of two gears and a different drum. The right side drive version is the same as the left except for the mainshaft. All 

frame, starter, and clutch interfaces are identical to stock 

1990-1999 models. 

FEATURES: 

- Compatible with most softails and custom builds 

- Two rail shift form system with common fork used three times 

- 2” diameter shift drum suspended by two radial ball bearings mounted to a 

fixed spindle axis 

- Ratchet pawl has overshift inhibitor (up and down) and is mounted on two 

radial ball bearings. Shift lever shaft cross sectional area is 65% larger 

than stock. 

- Frictionless detent system. A 3/8” primary ball bearing is cradled by, and 

rolls on, 50 secondary micro ball bearings. In turn, the cradle is part of a 

plunger that actuates during shifting and is guided by a tertiary linear micro 

ball bearing system. 

- Ignition kill and neutral switches top mounted for easy dwell timing 

adjustment. 

- Shift system lever ratio is 35% less than stock. Bearing mounted shift shaft 

yields low system hysteresis. Short, tight shifts are the result. N-1-2-3-4-5- 

6 shift pattern for false-neutral avoidance. 

- Shaft material is super strong 9310 – the best steel made – this isn’t 

standard by any means. Gears material is 8620. Very large 8.125 diameter 

pitch gear teeth. The gear teeth are 2x circumferentially thicker than stock. 

Tooth flanks are finish-ground after heat treat on a 1.5 million dollar 

grinder. AGMA class 12 grade gears. 

- Housing is all billet construction from 6061-T651 aluminum. We start with 

95 lbs of aluminum and end up with 17 lbs of case and 78 lbs of chips. 

GEAR RATIOS: 

R-RATIO Z-Ratio 

1st 2.75 2.61 

2nd 2.05 1.89 

3rd 1.55 1.50 

4th 1.18 1.12 

5th 1.00 1.00 

6th .86 .95 

Pn Description Fitment 

TB521L R-Ratio Polished LSD 5 spd Evo Softail and Custom 

TB621L R-Ratio Polished LSD 6 spd Evo Softail and Custom 

TB521R 

R-Ratio Polished RSD 5 spd Right Side Drive 

TB621R 

R-Ratio Polished RSD 6 spd Right Side Drive 

TBZ5L Z-Ratio Polished LSD 5 spd Evo Softail and Custom 

TBZ6L Z-Ratio Polished LSD 6 spd Evo Softail and Custom 

TBZ5R 

Z-Ratio Polished RSD 5 spd Right Side Drive 

TBZ6R 

Z-Ratio Polished RSD 6 spd Right Side Drive 

PN TB521L, 

PN TBZ6R, Z-ratio 

R-ratio left side 

right side drive 

drive 5-speed, 

6-speed 

MSRP $4695 MSRP $5595 

9

PN PBL701PN 

PN PBR7211PN 

MSRP $3595 MSRP $3695 

approachable function-formed look 

without having to pay for overkill strength 

The design directives for the TorqueBox were clearly established in the early stages of development. This flagship 

gearbox had to have a 250 ft-lb torque capacity gearset but externally look like 400 ft-lb standing still. Development 

costs and resultant retail price were deemed irrelevant. By choosing the venerable 6-71 blower for architectural 

inspiration, we inadvertently gave rise to what is now trademarked as Function Formed design. 

Enter the new PowerBox; Function Formed looks without the need to pawn your guns or your wife’s jewelry. Design 

inspiration from the TorqueBox coupled with a diamond ground 8620 steel 6-speed overdrive gearset gives the 

PowerBox an input torque capacity of 165 ft-lb, with a 400 ft-lb curb appeal; some may argue more. More because the 

tidy compact design of the PowerBox makes the function Formed design elements pop out more. 34Ds will always be 

noticed more on a petite chick than a larger chick; same concept. 

Pn Description FItment 

PBR701PN Show polished RSD PowerBox transmission assembly with standard ratios 1990-99 Softail-based RSD bikes 

PBR7211PN Show polished RSD PowerBox transmission assembly with ‘R’ ratio gearset 1990-99 Softail-based RSD bikes 

PBL701PN Show polished LSD PowerBox transmission assembly with standard ratios 1990-99 Softail and Custom frames 

PBL7211PN Show polished LSD PowerBox transmission assembly with ‘R’ ratio gearset 1990-99 Softail and Custom frames 

GEAR RATIOS: 

- Standard ratio gears 1st through 6th: 2.94, 

2.21, 1.60, 1.23, 1.00, .86 

- R-Ratio gear ratios 1st through 6th; 2.82, 2.08, 

1.60, 1.23, 1.00, .86 

Features: 

- Hydraulic actuator with 1.5” piston standard. 

11/16” master cylinder recommended 

- RSD comes with choice of 29 tooth zero offset 

pulley, 23 tooth or 24 tooth .2” chain sprocket 

- RSD can be upgraded with various offset chain 

sprockets and sizes to suit application. No pulley 

option available due to tight actuator spider size 

- LSD comes with choice of pulley or sprocket 

- LSD can be upgraded to all pulley and chain sizes 

and offsets to suit application 

- No neutral switch for clean look 

- No cost upgrade to N1 drum 

- Speed sensor provision located on 

back of case requires .120 spacer 

- 12 point stainless steel ARP fasteners 

- Choice of standard and ‘R’ ratio gearsets 

10

Aluminum Alloy Race Pulley 

Race pulleys are the lightest pulleys available. A stock 32 tooth Harley pulley weighs 5.2 lbs and the equivalent Race 

pulley weighs 2.0 lbs; a 61% weight savings. This reduction in mass translates into reduced ‘flywheel effect’ and 

allows the engine to rev quicker. Hard anodized for wear resistance and corrosion protection. Absolutely required for 

performance applications but not recommended for high mile touring. Part numbers listed are zero offset and fit 1994- 

2006 applications. 1985-93 applications require sprocket spacer and seal retrofit. Call tech line to inquire about 32 tooth 

offset pulleys available in .25, .50”, 1.0”, 1.5”, and 2.0” offsets. Custom offsets available by 

special order. 

# of teeth Aluminum PN 

29 29BD-56 

30 30BD-56 

31 31BD-56 

32 32BD-56 

34 34BD-56 

PN 32BD-56 

MSRP $180 

Steel Long Life Pulley 

Made from a solid chunk of 1045 steel and are 23% lighter than stock. Recommended for performance applications 

where 100,000 mile pulley life is required. Part numbers listed are zero offset and fit 1994-2006 applications. 1985-93 

applications require sprocket spacer and seal retrofit. Call tech line to inquire about 32 tooth 

offset pulleys available in .25, .50”, .80”, .875”, and 1.0” offsets. 

# of teeth Steel PN 

29 29BD-56F 

30 30BD-56F 

31 31BD-56F 

32 32BD-56F 

33 33BD-56F 

34 34BD-56F 

PN 32BD-56F 

MSRP $169 

530 chain sprockets 

Moderate to extreme engine performance can raise hell with the stock secondary belt drive. The bullet proof remedy for 

this shortcoming is to convert to a 530 chain. Sprockets are available in 3 offsets; .2”, .5”, and .9”. The .2” sprocket is 

based off the PN 37709-89 21 tooth Sportster sprocket. The .9” sprocket is the maximum offset that can be used and still 

allow room for the chain to clear the inside of the inner primary housing. .5” and .9” sprockets are generally used for wider 

rear tire applications. Part numbers listed fit 1994-2006 applications. 1985-93 applications require sprocket spacer and 

seal retrofit. 

# of Teeth .2” Pn .5” Pn .9” offset 

19 19T02-56 

20 20T02-56 

21 21T02-56 21T05-56 

22 22T02-56 22T05-56 

23 23T02-56 23T05-56 23T09-56 

24 24T02-56 24T05-56 24T09-56 

PN 24T02-56 

MSRP $65 

MSRP $19- Spacer 

$5- Seal 

Sprocket Spacer 

Our sprocket spacer is a direct replacement for the stock spacer except 

ours is case hardened steel that has a Rockwell ‘C’ hardness of 55. No 

more gouging, no more leaks. 

PN 33344-94S Sprocket Spacer, 94-Up Big Twin & Sportster 

PN 12067B Main Drive Gear Seal, 94-06 Big Twin 

11

The BAKER Heavy Duty Throwout Bearing Kit replaces the failure-prone stock parts and eliminates throwout 

bearing associated headaches. The larger thrust bearing features a 97% greater surface area and 

77% greater static load capacity than that of the stock throwout bearing. The brass spacer eliminates the 

possibility of bearing crush and disintegration. It is the perfect compliment for those running heavy duty 

clutches in a high horsepower abusive environment. 

Features 

- Larger thrust bearing with 97% greater surface area than the stock throwout bearing. 

- 77% greater static load capacity than the stock throwout bearing. 

- Brass spacer eliminates the possibility of bearing crush and disintegration which can lead to costly 

transmission failures. 

MSRP $79 

PN Fitment 

TBK-56L 1987-2011 5 and 6-speed Big Twin models with left side drive and cable actuated clutch. 

PN 

BW127-56MC 

Description 

Pulley cover, chrome, cable type, Bat Wing 

Fitment 

- All BAKER RSD except PowerBox, TorqueBox, & DriveBrake 

MSRP $399 

BATWING PULLEY COVER FEATURES 

- Designed for extra pulley and belt coverage 

- Compatible with standard -87 style clutch cables 

- Includes ball ramp actuator assembly 

- Limited production run 

- Upgrade option on complete assemblies only $200 

- Thicker Billet Function Formed design of actuator eliminates flex from heavy duty clutches 

- Dipstick is deleted for neater packaging 

- Hydraulic line routing is hidden and cleaner 

- Black anodized, polished or chrome finish 

FITMENT: 

- BAKER RSD OD6 cast Softail cases 

- All 530 chain sprockets and 30-tooth belt pulleys 

PN 

Description 

465-6P Door and Hydraulic Actuator - Polished 

465-6C Door and Hydraulic Actuator - Chrome 

465-6BA 

Door and Hydraulic Actuator - Black Anodized 

The Voyeur top cover is compatible with the late style (small pawl pin) ratchet pawls used from 1999-2006 except 

1999 Softail and gives you a full view of the shift system and partial of the gearset through the top cover made from 

billet optical grade Zelux, annealed and vapor polished for a clear view. 

Will fit all BAKER products from Mid-2004-up with BAKER 555-56A & 555-56L ratchet pawls. Voyeur top cover can 

be used on other 5&6 speed applications if upgraded with a BAKER ratchet pawl. The old style ratchet is bulky and 

interferes with the inside of the top cover on downshifts. Note: Not compatible with any Dyna applications, BAKER 

Billet series transmissions, TorqueBox, & DSSC 

Pn 

Description 

441-56P Top Cover, Zelux Voyeur 

MSRP $295 

BAKER Clutch Pack Replacement Kits contain all necessary fiber and steel plates 

to restore like new performance to your BAKER clutch. 

The Trans Rebuild Kit is an all inclusive kit designed to freshen up those high 

mileage bikes. Developed to work specifically with our OD6, DD6, DD5 and OEM5 

left side drive transmissions. Includes bearings, snap rings, gaskets, seals and 

retaining nuts. 

Call the BAKER tech line for part numbers and applications. 

Rebuild Kit MSRP $175 

Clutch Pack Kit, MSRP $200 

12

MSRP $1395 MSRP $695 

MSRP $95 

AC/DC Pinion 

Used to convert your 

102 tooth configuration to 

a 66 tooth configuration 

“Torque capacity of a clutch is dictated by the diameter and 

the number of clutch plates.” So the goal was to implement 

the biggest diameter clutch plates that would fit underneath 

the starter ring gear minor diameter. We found the biggest 

ones in a Cadillac 5-speed automatic tranny so we designed 

a clutch around 20 of these massive plates. 

FEATURES: 

- Fits any Big Twin from 1990-2006 (except 2006 Dyna). 

- 20, 7 inch diameter, single sided K2 friction plates 

- Three interchangeable coil spring options. Light, medium and heavy. 

- BAKER’S exclusive1-piece clutch basket and 66 tooth ring gear design 

- Larger torque capacity 

- Positive pressure plate alignment with Perma-Glide bearings 

- Red anodized clutch carrier and pressure plate 

OPTIONS: 

- AC/DC Pinion gear available for use with 102 tooth configurations 

- 35, 36, 37,or 38-Tooth 8620 steel sprocket options 

- Outer bearing support. ** Designed to work directly with the FF Primary 

PN: SP1000 

Fitment 1994-2006 

(except 06 Dyna) 

The 9-plate clutch is the competitively priced smaller 

brother of the KKK. A must have for all 1990-93 Big 

Twins, and 1994 and newer Big Twins with 9 tooth pinion, 

this clutch comes with BAKER Drivetrain’s standard for 

premium products. It has a one piece basket, which is 23% 

larger than stock, and a hard anodized hub for increased 

strength and durability. We moved the friction material 

towards the outer diameter of the plate, which increases 

torque capacity and reduces heat build-up, all resulting in 

a longer clutch life. 

FEATURES: 

- Fits any Big Twin from 1990-2006 (except 2006 Dyna). 

- Blue anodized clutch carrier and pressure plate 

- Compatible with applications up to 125 ft-lbs. Diaphragm-type pressure 

plate spring with ergonomic break-over feel during disengagement. 

- Comes with standard diaphragm spring installed, and a seperate heavy 

duty rated spring. 

- 9 Kevlar 2-sided clutch plates with large mean radius 

- BAKER’S exclusive1-piece clutch basket and 66 tooth ring gear design 

- Standard and Heavy-duty springs included 

PN 

20P200-KK-35 

20P200-KK-36 

20P200-KK-37 

20P200-KK-38 

20P200-KK-S-35 

20P200-KK-S-36 

20P200-KK-S-37 

20P200-KK-S-38 

Description 

KKK w/35 Tooth Clutch Sprocket 




KKK w/35 Tooth Clutch Sprocket & Outer Bearing Support 




OPTIONS: 

- available with a 35, 36, 37, or 38 tooth 8620 steel sprocket 

- AC/DC Pinion gear available for use with 102 tooth applications 

PN 

9P300-56-35 

9P300-56-36 

9P300-56-37 

9P300-56-38 

Description 

9 Plate w/35 Tooth Clutch Sprocket 




13

STRONGEST CLUTCH BY DESIGN 

Street performance 9-plate 

clutch basket 

King Kong Klutch basket 

Both our King Kong Klutch and 

Street Performance 9-plate Clutch 

have 66 Tooth ring gears - the stock 

basket here has 102 teeth. 

Stock clutch 

Starting tip of the day 

Never snap the throttle open and 

closed when the starter is engaged 

and turning over the motor. If you 

have a clutch with a 102 tooth ring 

gear, you could shear teeth. If you 

have a 66 tooth ring gear, you 

could bend the mainshaft on the 

transmission. 

The fundamental design approach of the BAKER clutches is different than anything available from the factory or other 

aftermarket manufacturers. For strength reasons, we manufacture our clutch with a 1-piece ring gear/basket. First, a 

large donut shaped forging is turned on a CNC lathe to the shape of the finished basket. Next the internal splines for the 

friction plates are formed with a 6-foot long broach. Threads for attachment of the carrier are machined on a mill, then 

the ring gear teeth are hobbed on the same type of machine that makes our gears. It is not cheap to make the heart and 

soul of our clutches in this manner but the end result justifies the expense. 

The radial strength gained by integrally putting the ring gear around the basket is analogous to the steel bands placed 

around a whisky barrel. Without the steel bands, the barrel would explode and that would be alcohol abuse. Additionally, 

the ring gear is supported by the hoop of the basket and this guarantees the T.I.R. at the pitch line of the ring gear teeth 

(no egg shaped ring gear). 

We only manufacture clutches with the 66 tooth ring gear. In 1994, Harley migrated from the 66 tooth ring to a 102 tooth 

design to achieve more starting torque. The flip side of that is the teeth sheer off especially on modified motors. 

35-Tooth Sprocket 36-Tooth Sprocket 37-Tooth Sprocket 38-Tooth Sprocket 

KKK clutch diameter dwarfs the 

factory clutch plate 

Clutches fit 1990-2006 big twin models 

(except for 06 Dyna). 

14

The BAKER XL6 is a six-speed overdrive ‘cartridge style’ gearset 

that converts any existing 1991-2003 Sportster/Buell to a BAKER 

six speed. 2nd through 5th gear ratios are effectively the same as 

stock, 6th gear is a true overdrive for a 511rpm drop at 75mph. 

XL6 KITS INCLUDE: 

- 6061-T6 trap door 

- Complete gearset including shafts and gears, less 

the 5th (maindrive) gear pair. 5th gear pair from 

existing 5-speed is re-used with the XL6 installation. 

- Gearset is assembled to the trap door including 

bearings, ball bearings, thrust washers, and 

retaining rings. 

- Shift drum and detent plate with optimized geometry. 

No flimsy retaining clip to hold the detent plate to the 

drum. Ours is bolted on with a machine screw. 

- Low effort detent spring. 

- Three billet steel shift forks with roller pins and 

cotter pins. 

- Steel template for accurate case modification. 

- ‘XL6’ engraved derby cover (P/N 202 & 203). 

PN 202 XL6 cartridge gearset 

MSRP $2350 

Other drivetrain components for Sportster/Buell: 

Steel Long Life Pulley 

PN DESCRIPTION Fitment 

271-5 Smooth shift kit, for stock 5-speed 5-speed 

291-5 Reverse pattern drum, stock 5-speed 5-speed 

299-5 Trap door, Stock 5-speed 5-speed 

292-56 26 tooth pulley, aluminum race 5-speed or XL6 

292-56F 26 tooth pulley, long life steel 5-speed or XL6 

293-56 28 tooth pulley, aluminum race 5-speed or XL6 

293-56F 28 tooth pulley, long life steel 5-speed or XL6 

230-56S 530 Chain conversion kit, 48/23 ft/rr 1991-2003 Buell 

231-56S 530 chain conversion kit, 50/23 ft/rr 1991-2003 Buell 



Race Pulley 

XL 5-Speed Smooth 

Shift Kit 


201 XL6 Builder’s Kit 91-94 Sportster/Buell 

202 XL6 Builder’s Kit 95-03 Sportster/Buell 

203 XL6 Builder’s Kit For S&S Dry 91-03 S&S dry xl case 

Primary Case Only 

NOTES: 

- Standard ratios for the PNs shown above are 2.52, 

1.96, 1.44, 1.18, 1.00, .86 

- Specify ‘S’ ratio 1st (2.37) and 2nd (1.88) by 

changing the ‘0’ in the PN to a ‘2’ 

- Specify no-cost reverse pattern (1-up, 5-down) drum 

by adding an “R” to the PN 

15 

Billet 5-Speed Door

shown PN BD-BDM-1/2 

$2995 MSRP 

We manufacture the whole drivetrain for 2005-later Big Dogs. The center distance of the primary drive is based on our 

DSSC and is not common with Softail. We used our knowledge of the factory system to develop our Synchronous Belt 

Drive. The pulleys are hobbed from stainless steel blanks for durability and corrosion resistance. The structural integrity 

of the stainless steel clutch pulley significantly reduces that loose tappet rattling sound that some other belt drives make 

when the clutch is disengaged. The indestructible pulleys are driven with a large tooth 2.4 inch belt and coupled with a 

radial ball bearing suspended outside bearing support. 


BD-BDM-1/2 Synchronous Belt drive, ½” offset, polished 2005-later, 250 tire bikes 

BD-BDM-0 Synchronous Belt drive, 0 offset, polished 2005-later, 300 tire bikes 

Service and support for Big Dog 

We service Big Dog transmissions and clutches and offer individual components for both. However we recommend our 

in-house rebuild service. Given our experience and our $50/hour shop rate it is highly recommended. Additionally, we 

offer derby covers, motor sprocket covers, inspection covers, inspection cover seal rings, pulley covers and pulley cover 

parts, optional primary paper gaskets, OEM primary O-rings, motor sprockets, and chains. Call our sales department for 

availability and pricing. 

16

WE’VE GOT SOCIAL NETWORKING SKILLS YO! 

BAKER is hip to the new way that our customers are learning and 

communicating - We have been paying attention the past few years to the 

growing number of bikers who spend their time online. We have also noticed 

that information passes quickly, and freely online. 

With that in mind: we have also launched a BAKER MySpace, BAKER 

Facebook and you can even catch up to the minute BAKER sales and 

updates on your phone by following us on Twitter. 

So look us up on your favorite social networking site to keep up with the 

latest happenings at BAKER. You will hear about what sales are hot, what 

deals we’re passing to our dealers, and more... we can’t gaurantee that you 

won’t get a random dirty joke or bathroom update. You’ve been forewarned. 

LOG ON AND FOLLOW US! 

BAKER ONLINE STORE: 

BAKER product offerings 10 years ago were pretty damn simple. We offered 8 different part numbers and that was it. Our 

printed catalog easily captured and conveyed our product line. American motorcycle enthusiasts got their information by 

calling our toll free number, reading magazines, and attending bar stool seminars. Back then, nobody in our world relied 

on, or trusted, the internet to obtain nitty-gritty details on neat new stuff for their scoot. But today, thanks to pornography, 

bikers are as web-savvy as the rest of the population. And it’s a good thing because BAKER product offerings these days 

number in the thousands and many configurational options are available for any one application. In 2009 we launched the 

new BAKER E-Commerce site to simplify the task of product selection for our dealers (password required) and the public. 

Look for the E-Commerce button prominently displayed on our home page. It will guide you interactively, through the 

maize of options, so you end up with the right configuration for your application. 

The ECommerce store has proved very quickly to be an excellent tool for our dealers and retail customers alike. For 

complete updates, log on, and make sure we have your email address in our database! It’s the best way not to miss out! 

17

6-speed baker brand made in the usa baker logo 

MSRP $20 

twisted fuck king of gears vintage baker 

dont forget your annual 

official baker calendar 

poster! 

BAKER has a full line of apparel including t-shirts, hats, stickers, tin signs 

and even shop jackets and shirts for men and women. Check out our 

Official BAKER Online Store for availability and the latest merchandise 

out there! What better way to brag about your BAKER? 

There Is More To A Transmission 

Than Just Metal 

As a company tenaciously focused on any improvement to the 

American Big Twin drivetrain, BAKER Drivetrain recognizes the 

fluid in the transmission is key in the performance and life of a 

transmission. It is a mechanical part of it as much as the gears, 

case, bearings, etc…so it must be of quality. The Spectro 

Platinum Heavy Duty 6-Speed Transmission Lubricant meets 

our BAKER Drivetrain quality standards for recommended 

transmission oil. Our standard for recommending oil is that it 

must have optimized properties tailored only for components 

in a V-Twin motorcycle transmission and it must exceed all 

others in excellence – like our own products do. Cheaper oils 

cannot provide all these qualities.Spectro’s 6-Speed formula 

base is synthetic group 4 base stock which is the highest rating 

for a synthetic lubricant. It is pure with absolutely no petroleum 

product blended into it. 

PN BD-75W140 

MSRP $14 

18

The V-8 car culture and V-twin bike scene are similar in many ways; American muscle, performance, and 

torque . If you drop a ZZ572 into your project car, don’t overlook your transmission and rear end because that 

650 ft-lbs of torque is not kind to drivetrain components. Same goes for your project bike. Today’s 124+ inch 

motors can grenade an anemic clutch and slope transmission. Make sure to choose drivetrain components that 

are up to the task. Our tech experts have the street and strip knowledge necessary to help you determine the 

right gear ratios and drivetrain components for your application. After that, the biggest challenge will be finding 

new rear tires.

v072010 - Who-sells-it.com

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