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.
***All pre-2007 transmission cases have been made obsolete by Harley-Davidson therefore procurement of new transmission cases is no longer possible. To continue offering complete transmission assemblies for pre-2007 models, BAKER has instituted a transmission case reclamation program in which used cases are procured from the secondary market and restored to a like-new condition. The reclamation process includes:
1. Procurement of pre-2007 case
2. Dimensional certification of key dimensions and positional attributes. All threaded holes are validated.
3. Factory paint is chemically removed and all gasket surfaces taped off with blast-proof masking products. Threaded holes are plugged.
4. Prepped case is media blasted with aluminum oxide @150 psi to prep surfaces for new powder coat
5. Gasket surfaces are re-taped with temperature-resistant masking products and fresh powder coat is applied.
6. Case finish is inspected and all threaded holes are chased.
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.
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.
FL Case Differentiations
To see an illustrated example of the differences between FL cases by year, please open the PDF here.
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.
The OD6 comes in a standard ‘2.94’ or optional ‘3.24’ 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, our (stock) 3.24 1st gear will have a single notch around the center of 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
|1st Gear||2.94 / Optional 3.24|
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
Builder’s Kit Part Numbers
All Part Numbers Listed Are Standard 2.94 Gear Ratios
|New PN||Old PN||Description||Fitment|
|OD6-T401||T401||OD6 Builder’s Kit Tapered Shaft||1987-89 FLT-FLH, Softail & FXR|
|OD6-401||401||OD6 Builder’s Kit||1990-92 FLT-FLH1990-97 Softail1990-94 FXR1991-97 Dyna|
|OD6-401S||401S||OD6 Builder’s Kit||1999 FXR1998 Dyna1998-99 Softail|
|OD6-401SP||401SP||OD6 Builder’s Kit||1999-00 Dyna|
|OD6-401P||401P||OD6 Builder’s Kit||2000-06 Softail2001-05 Dyna|
|OD6-402||402||OD6 Builder’s Kit||1993-97 FLT-FLH|
|OD6-402S||402S||OD6 Builder’s Kit||1998 FLT-FLH|
|OD6-404SP||404SP||OD6 Builder’s Kit||1999-00 FLT-FLH|
|OD6-404P||404P||OD6 Builder’s Kit||2001 FLT-FLH|
|OD6-404P2||404P2||OD6 Builder’s Kit||2002-06 FLT-FLH|
Builder’s Kit Notes
-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 877-640-2004.
Complete Build Part Numbers
All Part Numbers Listed Are Standard 2.94 Gear Ratios
|New PN||Old PN||Description||Fitment|
|OD6-T701||T701||OD6 Complete Trans Tapered Shaft||1987-89 Softail|
|OD6-T702||T702||OD6 Complete Trans Tapered Shaft||1987-89 FLT-FLH & FXR|
|OD6-701||701||OD6 Complete Transmission||1990-97 Softail|
|OD6-702||702||OD6 Complete Transmission||1990-94 FXR1990-92 FLT-FLH|
|OD6-703||703||OD6 Complete Transmission||1991-97 Dyna|
|OD6-704||704||OD6 Complete Transmission||1993-97 FLT-FLH|
|OD6-801||801||OD6 Complete Transmission||1998-99 Softail|
|OD6-803||803||OD6 Complete Transmission||1998 Dyna|
|OD6-804||804||OD6 Complete Transmission||1998 FLT-FLH|
|OD6-901||901||OD6 Complete Transmission||2000-06 Softail|
|OD6-902||902||OD6 Complete Transmission||1999 FXR|
|OD6-903||903||OD6 Complete Transmission||1999-00 Dyna|
|OD6-904||904||OD6 Complete Transmission||1999-00 FLT-FLH|
|OD6-003||003||OD6 Complete Transmission||2001-05 Dyna|
|OD6-004||004||OD6 Complete Transmission||2001 FLT-FLH|
|OD6-0042||0042||OD6 Complete Transmission||2002-06 FLT-FLH|
Complete Build Notes
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 and ‘01’- Chrome finish (Chrome Available only on 1990-97 Softail Billet Cases); example: OD6-70103
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.
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
OD6 installation instructions with exploded views: Click Here
OD6R Exploded View Diagram addendum:
OD6R Addendum with exploded views: Click Here
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 877-640-2004.
1st Gear Design Change
1st Gear Change Addendum-March 2012: Click Here
These example finishes are intended to show the exterior treatments of cases, top covers and doors.
TERM AND CONDITIONS
LIMITED WARRANTY POLICY
BAKER™ transmission assemblies, transmission kits, primaries, and oil pans are guaranteed to the original purchaser to be free of manufacturing defects in materials and workmanship for a period of 5 years from the date of purchase or up to 50,000 miles. BAKER™ clutches, kicker cover kits, belt drives, F6F kit, reverse systems, covers and accessories are guaranteed to the original purchaser to be free of manufacturing defects in materials and workmanship for a period of 2 years from the date of purchase or up to 24,000 miles - whichever occurs first. If the product is found by BAKER™ to be defective, such products will, at the option of BAKER™, be replaced or repaired at cost to BAKER™.
In the event warranty service is required, the original purchaser must call or write BAKER™ immediately with a description of the problem. If it is deemed necessary for BAKER™ to make an evaluation to determine whether the transmission assembly or transmission kit or accessory is defective, the entire transmission assembly, whether originally purchased as an assembly or kit, must be properly packaged and returned prepaid to BAKER™ with a copy of the original invoice of purchase. If after an evaluation has been made by BAKER™ and a defect in materials and/or workmanship is found, BAKER™ will, at BAKER™ option, repair or replace the defective part of the assembly.
WARRANTIES FOR "INSIDER SPECIAL" PRODUCTS
Due to the uniqueness, low price and assembly outside of typical production process of products indicated as Insider Special products, purchasing these Insider Special products include a warranty so to guarantee the original purchaser to be free of manufacturing defects in materials and workmanship for a period of 1 year from the date of purchase or up to 12,000 miles. We have provided extended options for you to purchase below.
RETURNS AND EXCHANGES
Any merchandise returned for any reason (exchange, credit or modification) must be accompanied by a Return Goods Authorization (RGA) number or it will be refused. Call BAKER™ to obtain this number prior to returning goods for any reason. There is a 15% re-stocking fee for all returned items. BAKER™ is not liable for any shipping charges.
ADDITIONAL WARRANTY PROVISIONS
NOTE: Limited warranty does not cover labor or other costs or expenses incidental to the repair and or replacement of BAKER™ products.
This warranty does not apply if one or more of the following situations is judged by BAKER™ to be relevant: BAKER™ OEM transmissions; (these are subject to the OEM manufactures warranty only), Improper installation, accident, modification (including but not limited to use of unauthorized parts, transmission oils or lubricants), racing, high performance application, mishandling, misapplication, neglect (including but not limited to improper maintenance), or improper repair.
BAKER™ shall not be liable for any consequential or incidental damages arising out of or in connection with a BAKER™ transmission assembly, transmission kit, component or part. Consequential damages shall include without limitation, loss of use, income or profit, or losses sustained as the result of injury (including death) to any person or loss of or damage to property.
BAKER™ transmissions, transmission kits and accessories are designed exclusively for use in American V-Twin motorcycles. BAKER™ shall have no warranty or liability obligation if BAKER™ parts are used in any other application.
If it is determined that a BAKER™ product has been disassembled during the warranty period for any reason, this limited warranty will no longer apply unless you were instructed to do so by a BAKER Drivetrain technician for diagnostic purposes.
The words H-D®, Softail®, FXR®, Dyna®, FLT®, FLH®, Sportster®, and Buell® are registered trademarks and are for reference only.
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