OD6: Overdrive 6-Speed



 

 

THE ORIGINAL 6-SPEED 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 todays 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

OD6 Builder’s Kit Contents

 

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 / Optional .80
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 / Optional .80

 

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
– 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.

-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

 

 

 

Recalibration Box PN 95E-56A

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 Upgrades
– Function Formed Oil Spout (for 1993-Later FLT/FLH Models only)
– +1 Quart Oil Pan (for 1993-Later FLT/FLH Models only)
– Inner Primary High Torque Bearing Kit
– SP9: Street Performer 9 Plate Clutch
– King Kong Klutch
– Front or Rear Feed LSD Hydrualic Side Cover
– Function Formed LSD (Left Side Drive) Bearing Door
– Sprockets
– Pulleys

– Bully Derby Cover (1999-2006 5 Hole Derby Cover Models)

-Truss Style Shift Lever

 

Click on any of the images below to learn more

FLH/ FLT Function Formed Oil Spout

+1 Quart Oil Pan

High Torque Bearing Kit

SP9- Street Performance 9 Plate Clutch

King Kong Klutch

FF LSD Hydro Side Covers

Function Formed Bearing Door

Sprockets

Pulleys

Bully Derby Cover

Truss Style Shift Lever

 

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 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

Back to the Top 

 

Product

OD6 Gearset

Polished OD6 FLT-FLH Transmission, PN 0042P with Black Ano FF Bearing Door & +1 Pan

Polished FXR OD6 Transmission PN 902P

Polished FLT-FLH OD6 Evo PN 804P

 

Lifestyle

Scott Smalley’s Twin Cam Road King with OD6

Scott Smalley’s Twin Cam Road King with OD6

Scott Smalley’s Custom Street Glide with OD6

Kreator Custom, Twin Cam OD6 Complete w/ Hydraulic Side Cover

Tom Kahler’s 2000 Modified FXDX with OD6

Dar Holdsworth’s Navy Tribute Rolling Thunder Bike

Billy Lane’s Air Force Tribute Rolling Thunder Bike

Billy Lane’s Air Force Tribute Rolling Thunder Bike

 

 

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