6 gear transmission OD6: Overdrive 6-Speed Complete Transmission 1990-1997 Softail, Polished Case, 2.94 1st Gear, Polished Covers

6 gear transmission OD6: Overdrive 6-Speed Complete Transmission 1990-1997 Softail, Polished Case, 2.94 1st Gear, Polished CoversThis is the ORIGINAL 6 speed design that revolutionized the American V Twin industry. Yet, its still the best overdrive 6 speed built to this dayhands down. Our OD6 is built to comfortably handle the power from today's 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 builders kit for your stock

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 today's 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.

If you are looking for a transmission replacement with a tapered mainshaft, we offer a 5-speed gearset and 5-speed complete transmission.

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.

Features

• Billet 6061-T6 bearing door
• 1/8″ thick bearing retainer plate
• Redundant Neutral smooth shift system
• Hard chrome plated shift forks
• Diamond cut gearset made out of 8620 steel
• All transmission seals, gaskets and hardware
• 5 year limited warranty

Fitment

• 1990-97 Softail
• 1998-99 Softail

Part Numbers

Benefits

• Stronger than stock
• Lower RPM for smoother highway speeds
• Fuel efficiency

Detail

Bearing Door
OD6 bearing doors are a 1/2″ wider at the mounting flange then a stock 5-Speed door due to the 6th gear. The OD6 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 OD6 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 OD6 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. This tighter control on the gears yield a silent operation. 

Ratios
The OD6 comes in a standard ‘2.94’ configuration. A way to physically tell which ratio you have is pretty common knowledge here at BAKER, but if you would like to know look at the 1st gear pair on the gearset. Our standard 2.94 1st gear will not have a notch on the 1st countershaft gear. Use the image on the far right for reference. This is very important to know if you need any replacement parts or components.

The OD6 comes in a standard, optional or R-Ratio configuration 

Shift Forks
Our billet steel forks are 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)
• Reverse Pattern Shift Drum (6-5-4-3-2-N-1) 

Complete Build Case Finish Options

Add suffix to the end of the part number, ‘02’ for Polished, ‘06’ for Raw and ‘03’ for Wrinkle Black

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. 

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

Click on the image to Compare the OD6 and DD6 gearsets

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 OD6 Fluid Capacity Dry: 22-24fl-oz 
• BAKER OD6 Fluid Capacity Wet: 18-22fl-oz

Learn more about Spectro Performance Oils here: https://spectro-oils.com/

Installation Instructions

OD6 installation instructions with exploded views: Click Here

Installation Note:

We started providing install DVD’s with every builder’s kit starting in October 2012. At approximately 3:25 of the OD6 portion of the DVD, Bert talks about modifying the shifter pawl. This modification is related to the stock shifter pawl lever assembly (H-D PN 34972-02B) and the use of BAKER 5-6QSN & 5-6QLN shift drums. We now provide a shift drum BAKER PN 124-0D6, which supercedes the 5-6QSN, 5-6QLN Shift, 5-6QEN, 5-6QFN & 5-6QGN shift drums, that requires no shimming and works with BAKER shifter pawl 555-56C or 555-56LD (depending on year or motorcycle) which we include in kits and on all BAKER complete builder’s kits. We do not sell any kits, shift drums or transmissions that require any shifter pawl with BAKER marked on it, that needs to be ground or modified anyway. Any questions, please call us at 517-339-3835.

1st Gear Design Change

1st Gear Change Addendum-March 2012: Click Here