Share to FB

OD6: Overdrive 6-Speed Complete 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 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.

  • 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
  • Optional Gear Ratios
  • All transmission seals, gaskets and hardware
  • 5 year limited warranty
  • 1987-89 FLT-FLH, Softail & FXR
  • 1990-92 FLT-FLH
  • 1990-97 Softail
  • 1990-94 FXR
  • 1991-97 Dyna
  • 1999 FXR
  • 1998 Dyna
  • 1998-99 Softail
  • 1999-00 Dyna
  • 2000-06 Softail
  • 2001-05 Dyna
  • 1993-97 FLT-FLH
  • 1998 FLT-FLH
  • 1999-00 FLT-FLH
  • 2001 FLT-FLH
  • 2002-06 FLT-FLH

Benefits

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

 

     

          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.

           

          OD6 Ear & No Ear Bearing Door

          OD6 Bearing Door vs. Stock

          Thickness Comparison

          Redundant Neutral System

          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.

          FL Case Differentiations
          To see an illustrated example of the differences between FL cases by year, please open the PDF here.

          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’, optional ‘3.24’ or R-Ratio ‘2.82’ 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 and our 2.82 (R-Ratio) 1st gear will have 2 notches around the 1st gear countershaft. Use the image on the far right for reference. This is very important to know if you need any replacement parts or components.


          OD6 Gearset Layout

          OD6 1st Gear Ratio

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

          Standard Ratios
          1st Gear 2.94 / Optional 3.24
          2nd Gear 2.21
          3rd Gear 1.60
          4th Gear 1.23
          5th Gear 1.00
          6th Gear .86
          R-Ratio Ratios
          1st Gear 2.82
          2nd Gear 2.08
          3rd Gear 1.60
          4th Gear 1.23
          5th Gear 1.00
          6th Gear .86

           

          OD6 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

          • 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) 

          Builder’s Kit Part Numbers
          All Part Numbers Listed Are Standard 2.94 Gear Ratios

          PN Description Fitment
          T401 OD6 Builder’s Kit Tapered Shaft 1987-89 FLT-FLH, Softail & FXR
          401 OD6 Builder’s Kit 1990-92 FLT-FLH1990-97 Softail1990-94 FXR1991-97 Dyna
          401S OD6 Builder’s Kit 1999 FXR1998 Dyna1998-99 Softail
          401SP OD6 Builder’s Kit 1999-00 Dyna
          401P OD6 Builder’s Kit 2000-06 Softail2001-05 Dyna
          402 OD6 Builder’s Kit 1993-97 FLT-FLH
          402S OD6 Builder’s Kit 1998 FLT-FLH
          404SP OD6 Builder’s Kit 1999-00 FLT-FLH
          404P OD6 Builder’s Kit 2001 FLT-FLH
          404P2 OD6 Builder’s Kit 2002-06 FLT-FLH

           

          Builder’s Kit Notes

          • The OD6 is available with a 3.24 optional 1st gear ratio . Change the middle numeral ‘0’ to a ‘1’. example: 411P
          • For R-Ratio gears change the middle number ‘0’ to ’21′; example 4214P

           

            -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 555-56L (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

            PN Description Fitment
            T701 OD6 Complete Trans Tapered Shaft 1987-89 Softail
            T702 OD6 Complete Trans Tapered Shaft 1987-89 FLT-FLH & FXR
            701 OD6 Complete Transmission 1990-97 Softail
            702 OD6 Complete Transmission 1990-94 FXR1990-92 FLT-FLH
            703 OD6 Complete Transmission 1991-97 Dyna
            704 OD6 Complete Transmission 1993-97 FLT-FLH
            801 OD6 Complete Transmission 1998-99 Softail
            803 OD6 Complete Transmission 1998 Dyna
            804 OD6 Complete Transmission 1998 FLT-FLH
            901 OD6 Complete Transmission 2000-06 Softail
            902 OD6 Complete Transmission 1999 FXR
            903 OD6 Complete Transmission 1999-00 Dyna
            904 OD6 Complete Transmission 1999-00 FLT-FLH
            003 OD6 Complete Transmission 2001-05 Dyna
            004 OD6 Complete Transmission 2001 FLT-FLH
            0042 OD6 Complete Transmission 2002-06 FLT-FLH

             

            Complete Build Notes

            • The OD6 is available with a 3.24 optional 1st gear ratio for higher horse power applications. Change the middle numeral ‘0’ to a ‘1’. example: PN 914
            • For R-Ratio gears change the middle number ‘0’ to ’21′; example 9214
            • The OD6 is available with a deep overdrive gear.80 6th; Please speak with our technical staff before picking this option; this is typically for big inch motor applications only.
            • Complete OD6 FLT-FLH transmissions come with Function Formed FL oil spout and dip stick 

            Complete Build Case Finish Options

              

            Raw Finish

             

            Wrinkle Black Finish

             

            Show Polished Finish

             

            Chrome Finish

            Add suffix to the end of the part number, ‘P’ for Polished, ‘R’ for Raw and ‘B’ for Wrinkle Black and ‘C’- Chrome finish (Chrome Available only on 1990-97 Softail Billet Cases); example: 701B

             

            BAKER Case vs. Aftermarket

            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. 

            Exhaust Bracket

            Exhaust Bracket
            Due to the OD6 bearing door being a 1/2″ wider than stock some FLT / FLH models may require a modified exhaust bracket for the mounting of the exhaust to the bottom of the bearing door. This modified bracket is about a 5/8″ difference from stock to accommodate the new door width.This bracket is sold separately from the kit. BAKER PN 188-6 

            Speedo Recalibration Unit

            Special Note

            • Speedo recalibration unit is required for electric speed sensor applications; PN 95E-56A. 

            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


            OD6 vs. DD6

            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

            Installation Instructions

            OD6 installation instructions with exploded views:Click Here

            OD6R Exploded View Diagram addendum:
            OD6R Addendum 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 555-56L (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

            Standard Gear Case Finish Examples (Not applicable to all products)

            Chrome

            Polished

            Raw

            Wrinkle Black

            These example finishes are intended to show the exterior treatments of cases, top covers and doors.

            TERM AND CONDITIONS                                                                                         

             

            BAKER Drivetrain reserves the right to change prices, terms or policies at any time without notice.

            Orders can be pre-paid using Visa, MasterCard, American Express, Discover or PayPal.

            All orders not pre-paid will be sent C.O.D. certified check or money order only unless pre-approved for company check acceptance.

            Any orders from outside the USA must be pre-paid in US funds via wire transfer; a $30 transfer fee will apply.

            Prices shown are F.O.B. Haslett, MI.

             

            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. 

             

            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.

             

            Customer Reviews

            Based on 1 review Write a review
            Questions? Ask us anything:
            Contact us
            Or just call us at 517-339-3835. We're glad to help.

            OD6: Overdrive 6-Speed Complete Transmission
            Move your mouse over image to zoom. Click to enlarge.
            OD6: Overdrive 6-Speed Complete Transmission OD6: Overdrive 6-Speed Complete Transmission for 1986-2006 Harley-Davidson motorcycles Big Twin OD6: Overdrive 6-Speed Complete Transmission for 1986-2006 Harley-Davidson motorcycles Big Twin OD6: Overdrive 6-Speed Complete Transmission for 1986-2006 Harley-Davidson motorcycles Big Twin OD6: Overdrive 6-Speed Complete Transmission for 1986-2006 Harley-Davidson motorcycles Big Twin OD6: Overdrive 6-Speed Complete Transmission for 1986-2006 Harley-Davidson motorcycles Big Twin OD6: Overdrive 6-Speed Complete Transmission for 1986-2006 Harley-Davidson motorcycles Big Twin OD6: Overdrive 6-Speed Complete Transmission for 1986-2006 Harley-Davidson motorcycles Big Twin OD6: Overdrive 6-Speed Complete Transmission for 1986-2006 Harley-Davidson motorcycles Big Twin OD6: Overdrive 6-Speed Complete Transmission for 1986-2006 Harley-Davidson motorcycles Big Twin