direct gear DD6: Direct Drive 6-Speed Builder's Kit 1990-1994 FXR, 1990-1997 FLH-FLT, 3.24 1st Gear, Polished No Ear Door, N1 Shift Pattern

direct gear DD6: Direct Drive 6-Speed Builder's Kit 1990-1994 FXR, 1990-1997 FLH-FLT, 3.24 1st Gear, Polished No Ear Door, N1 Shift PatternFrom an engineering standpoint, it is difficult to design a machine or mechanism that achieves multiple objectives with minimal compromise. An amphibious car is a good example. A few have been manufactured over the years, and they achieved the goal of navigating on land and water, but did neither very well. On the other hand, a Swiss Army knife achieves multiple objectives with minimal compromise. You can snatch the cork out of a wine bottle or kill

Features

• Billet 6061-T6 bearing door
• 1/8″ thick bearing retainer plate
• Helical & spur gear design gear for quiet operation
• 28 tooth comprocket forged out of 8620 gear steel
• Regina® double row primary chain
• All transmission seals, gaskets and hardware
• 5 Year limited warranty

 Benefits

• Smoother shifting
• Positive, certain shifting
• Easier-to-find neutral
• Quieter operation
• More-efficient torque-handling

Fitment

• 1990-97 Softail
• 1991-97 Dyna
• 1990-94 FXR
• 1990-97 FLT-FLH
• 1998-99 Softail
• 1998-00 Dyna
• 1999 FXR
• 1998-00 FLT-FLH
• 2000-06 Softail
• 2001-05 Dyna
• 2001-06 FLT-FLH

***PLEASE CALL 517-339-3835 FOR SCREAMING EAGLE 6-SPEED TRANSMISSION APPLICATIONS.

***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. * Limited supply of chrome bearing doors with ear available. Please give us a call at 517-339-3835 to order a chrome bearing door.

Part Numbers

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 with ear available. Please give us a call at 517-339-3835 to order a chrome bearing door.

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

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.

Available No Cost Options

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

Available at an Additional Cost

27T Comp Sprocket, available on FL models for a more aggressive primary ratio. Not compatible on Softails or Dyna models due to the inner primary design. 

The DD6 comes in a standard 3.24 1st Gear.

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

Effective Ratios- shown above are with the 28 tooth comp sprocket

Builder’s Kit Notes

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

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. (Call us to ensure ordering accuracy)

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. 

Click on the image to Compare the DD6 and OD6 gearsets

Recommended Upgrade

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 DD6 Fluid Capacity Dry: 22-24fl-oz
• BAKER DD6 Fluid Capacity Wet: 18-22fl-oz

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

Installation Instructions
DD6 installation instructions with exploded views: Click Here