DD6: Direct Drive 6-Speed Complete Transmission

If you enjoy riding for long periods of time you will enjoy the quiet, vibration dampened, worry free riding that comes with this transmission. This is the transmission for the serious rider who enjoys putting on the miles each time he gets on his bike. With the silent smoothness, vibration dampening, and direct drive engineering, you and your bike will enjoy the long haul for years to come.

The sprocket/pulley is not included in the complete transmission assembly. For the acquisition of these components, kindly contact BAKER Drivetrain at 517-339-3835.

Fitment

• 1990-99 Softail
• ***PLEASE CALL 517-339-3835 FOR 12MM MAINSHAFT (FOR WIDE TIRE APPLICATIONS)

Bearing Door Type: All DD6 bearing doors have the same outer profile as a stock 5 speed so exhaust brackets, torque arms etc. fit like stock. The DD6 door comes with or without an ear. The ear door is for exhaust bracket mounting and does not fit 1993-2006 FL applications.

12mm Mainshaft: Call 517-339-3835 or chat with us via the website to ensure ordering accuracy.

Part Numbers

DD6-71103	DD6 Transmission Assembly, 1990-1997 Softail, Black Case, 3.24 1st Gear, Polished Covers, Standard Shift Pattern
DD6-71103-N1	DD6 Transmission Assembly, 1990-1997 Softail, Black Case, 3.24 1st Gear, Polished Covers, N1 Shift Pattern
DD6-71102	DD6 Transmission Assembly, 1990-1997 Softail, Polished Case, 3.24 1st Gear, Polished Covers, Standard Shift Pattern
DD6-71102-N1	DD6 Transmission Assembly, 1990-1997 Softail, Polished Case, 3.24 1st Gear, Polished Covers, N1 Shift Pattern
DD6-71106	DD6 Transmission Assembly, 1990-1997 Softail, Raw Case, 3.24 1st Gear, Polished Covers, Standard Shift Pattern
DD6-71106-N1	DD6 Transmission Assembly, 1990-1997 Softail, Raw Case, 3.24 1st Gear, Polished Covers, N1 Shift Pattern
DD6-81103	DD6 Transmission Assembly, 1998-1999 Softail, Black Case, 3.24 1st Gear, Polished Covers, Standard Shift Pattern
DD6-81103-N1	DD6 Transmission Assembly, 1998-1999 Softail, Black Case, 3.24 1st Gear, Polished Covers, N1 Shift Pattern
DD6-81102	DD6 Transmission Assembly, 1998-1999 Softail, Polished Case, 3.24 1st Gear, Polished Covers, Standard Shift Pattern
DD6-81102-N1	DD6 Transmission Assembly, 1998-1999 Softail, Polished Case, 3.24 1st Gear, Polished Covers, N1 Shift Pattern
DD6-81106	DD6 Transmission Assembly, 1998-1999 Softail, Raw Case, 3.24 1st Gear, Polished Covers, Standard Shift Pattern
DD6-81106-N1	DD6 Transmission Assembly, 1998-1999 Softail, Raw Case, 3.24 1st Gear, Polished Covers, N1 Shift Pattern

Features

• Finding neutral is very easy with a redundant neutral detent
• Shifter Pawl assembly with improved geometry for a perfect response and built in overshift protection for smooth shifting
• 1st through 3rd gears are straight cut to prevent lateral tension in those high torque, short-used gears 

Detail

Bearing Door
All DD6 bearing doors have the same outer profile as a stock 5 speeds so exhaust brackets, torque arms etc. fit like stock. The DD6 door comes with or without an ear. The ear door is for exhaust bracket mounting and does not fit 1993-2006 FL applications. Note the images below. The DD6 door bearings are larger providing 25% more dynamic load capacity than stock bearings used through 1998, also uses a 1/8″ bearing retainer plate instead of stock style snap rings. * Limited supply of chrome bearing doors available. Please give us a call at 517-339-3835 to order a chrome bearing door.

Shift System
Our 6 Speed shift system with roller detent guarantees smooth shifts every time and our redundant neutral ensures  that finding neutral is a easy chore. We mount a plunger detent on the left side pillow block and cut a plunger track into the shift drum itself.  The plunger follows this track 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.

Gearset
All DD6 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.

DD6 Gearset Layout

Call 517-339-3835 or chat with us via the website to ensure ordering accuracy. Gears and Shafts Design

DD6 Shift Forks

Shift Forks
Our shift forks are made out of billet steel 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

• Standard Shift Drum (1-N-2-3-4-5-6)
• N1 Shift Drum (N-1-2-3-4-5-6)

 The DD6 comes in a stardard 3.24.

Standard	Ratios
1st Gear	3.77
2nd Gear	2.56
3rd Gear	1.87
4th Gear	1.44
5th Gear	1.15
6th Gear	1.00

Effective	Ratios
1st Gear	3.24
2nd Gear	2.20
3rd Gear	1.61
4th Gear	1.24
5th Gear	.99
6th Gear	.86

Standard Ratios- shown above are without the 28 tooth comp sprocket
Effective Ratios- shown above are with the 28 tooth comp sprocket 

Complete Build Part Numbers

All Part Numbers Listed Are Standard (Effective) Gear Ratios

New PN	Old PN	Description	Fitment
DD6-811*L	DD811*L	DD6 Complete Transmission	1998-99 Softail
DD6-711*L	DD711*L	DD6 Complete Transmission	1990-97 Softail

Complete Build Notes

• The DD6 is not designed to be used in conjunction with belt drive primaries,auto chain tensioners or easy pull clutch kits. 

Case Design
The BAKER Softail case design had all leak potentials in mind during the design. We added stud pads to the inside of the case so that the thread holes for the transmission studs were blind holes, NOT through holes like some aftermarket brands. Looking at the image on the right you can see the difference.

Special Note

• Speedo recalibration unit is required for electronic speed sensor applications; PN 95E-56B.
• A + 12MM mainshaft length is available for wide tire applications.

Compare the DD6

See the difference between other transmission kits and our DD6 and OD6. Click Here for a PDF file comparing our DD6 and OD6 gearset against other manufacturers.