TC96B RSD Transmission


From 1990-2006, the Softail architecture and basic drivetrain dimensions were virtually unchanged as it relates to the 5-speed transmission, starter, clutch, and primary drive. Sure, there were small changes along the way but they were like having your sweetie convert her factory A-cups to B-cups. In 2007 with the advent of the Twin Cam 96” B motor and 6-speed cruise drive transmission, the drivetrain underwent radical changes such that the modern Softail drivetrain has almost nothing in common with its predecessors; like having your sweetie go from A-cups to DDD’s. Totally different chick. Our DD6R or Direct Drive 6-speed with right side output is designed to go in place of the factory left side drive 6-speed and bolt up to the new style primary, starter, and clutch.


– Fully assembled Direct Drive, Right Side Drive 6-speed transmission
– Straight cut 1st-3rd gears for strength, Helical cut 4th-6th gears for noise reduction
– Compatible with TC96 ci & Screamin Eagle TC110 ci engines
– TorqueBox type linear roller detent for superior shift quality
– Chrome trap door & top cover standard
– Comes standard with zero offset pulleys and chain sprockets, with many offset pulleys available at a nominal upcharge
– Case, and engine mount flange are machined from a solid chunk of 6061-T6 aluminum
– Backed by a 5yr limited warranty


Case Finish Options

You have 3 different options for case finish on the TC96B RSD.

Silver FInish

Wrinkle Black Finish

Show Polished Finish

Linear Detent Plunger

Shift System
Our 6 Speed shift system with linear detent guarantees smooth shifts every time and  ensures that finding neutral is a easy chore. We mount our shift drum on a fixed spindle with roller ball bearings. The smoothest manner possible. The plunger rides over the ‘clover leaf’ peaks during operation (shifting) and when shifting into neutral pops into a pocket. This system lets you feel that you’re shifting into neutral. No more guessing. Shift drum features more aggressive timing on the fork groove profiles and is case hardened to 58 Rockwell for wear resistance and crisp shifts. We built our reputation on smooth shifting 6-speed transmissions; our drum designs benefit from the engineering lessons learned.


All DD6R gearsets are made out of 8620 steel, gears are shaper cut before heat treat then precision ground with diamond coated tooling after heat treat (58-62 Rockwell ‘C’). This extra steps ensures not only a quieter gear pair, but enables much tighter backlash control. The gearset is a combination of helical and spur gears to yield silent gear operation. The dog teeth are backcut at a 1° angle to optimize the smooth shift possible, while standard gearsets are cut to a 4° angle. The mainshaft is unique with 1st main gear being incorporated as part of the shaft, the countershaft also features a unique 1-piece design with 6th gear.

TC96B RSD Gearset Layout


DD6R Shift Forks

Shift Forks
Our investment cast shift forks are made out of 4140 then dipped in a hard chrome plate bath for wear resistance, also designed with oil reliefs to ensure proper lubrication and wear resistance on fork blades and shift dogs.


Available No Cost Options
-Chain sprockets:

.200″ Offset (19T, 20T, 21T, 22T, 23T, 24T Counts)

.500″ Offset (21T, 22T, 23T, 24T Counts)

.900″ Offset (23T, 24T Counts)

-Zero Offset Steel Pulleys:

29T, 30T, 31T or 32T Counts


The TC96B comes with the following gear ratios:


Standard Ratios
1st Gear 3.45
2nd Gear 2.56
3rd Gear 1.87
4th Gear 1.44
5th Gear 1.15
6th Gear 1.00
Effective Ratios
1st Gear 2.94
2nd Gear 2.20
3rd Gear 1.61
4th Gear 1.24
5th Gear .99
6th Gear .86


TC96B RSD Part Numbers**

PN Description Fitment
DD6R901B DD6R Complete Assembly, Wrinkle Black 2007-Later Softail Custom
DD6R901R DD6R Complete Assembly, Silver 2007-Later Softail Custom
DD6R901P DD6R Complete Assembly, Polished 2007-Later Softail Custom

**Above part numbers do not include pulley covers. They are sold separately.


Recommended Upgrades

– Forged Pulley Covers, Mechanical or Hydraulic
– Low Profile Pulley Cover
– Offset Steel Pulleys

– Attitude Chain Adjuster Kit

– Bully Derby Cover

– Bully Primary Cover


Click on any of the images below to learn more

Pulley Cover, Mechanical, Forged

Pulley Cover, Hydraulic, Forged

Low Profile Pulley Cover

Offset Steel Pulleys

Attitude Chain Adjuster

Bully Derby Cover

Bully Primary Cover


Spectro Oil BD-75140

Recommended Fluid / Level

Picking the right transmission fluid ensures the life and durability of your transmission, that’s why BAKER recommends a fully synthetic GL-5 rated gear weight oil of 75W-140. If a GL-5 rated gear lube is not available, these commonly carried viscosities (weights) will work 75W-90, 75W-140 and 85W-140. BAKER does not recommend the use of Syn3 (20W-50). For Bert’s article on ‘Oil & Spiders’ Click Here


BAKER TC96B RSD Fluid Capacity Dry: 22-24fl-oz

BAKER TC96B RSD Fluid Capacity Wet: 18-22fl-oz


TC96B RSD Transmission, Forged Mechanical Pulley Cover & 24T02-56 Sprocket Installed

Dirico Motorcycles, Pro-Street



BAKER DRIVETRAIN| 9804 E. SAGINAW, HASLETT, MI, 48840 |1-877-640-2004| 517-339-3835 | FAX: 517-339-4590 @2012 BAKER INC