fast 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
SKU: 37409599756
fast gear

fast 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

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Description

fast 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

From 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 somebody all with the same widget. The DD6, or Direct Drive 6-speed, combines 3 technical approaches to achieve the most advanced transmission gearset design available for your Big Twin with minimal compromise. First, 1st through 3rd gears are straight cut (spur) for strength during maximum acceleration with no parasitic axial thrust. Secondly, 4th and 5th gears are automotive style helical gears for quiet and smooth operation as highway speed approaches. Lastly, 6th gear is direct drive which means there is no underdrive or overdrive in top gear which translates into 99% efficiency for minimum parasitic loss, minimum wear and tear, and maximum fuel efficiency. But we didn’t focus solely on the gearset, we made this sucker shift like glass. The sequential motion of the hard chrome plated forks is controlled by a fixed spindle radial ball bearing mounted shift drum. Hard chrome guarantees long fork life with minimal imposed friction on the fork groove of the gear. The fixed spindle drum design eliminates any chance of binding or imposed friction about the axis of drum rotation. Drum rotation is controlled by a roller detent and actuated by a BAKER shift pawl with a anti-overshift feature. To make finding neutral an easy chore, we mounted a redundant detent on the left side pillow block.
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

      DD6-411-02 DD6 Builder's Kit, 1990-1994 FXR, 1990-1997 FLH-FLT, 3.24 1st Gear, Polished No Ear Door, Standard Shift Pattern
      DD6-411-02-N1 DD6 Builder's Kit, 1990-1994 FXR, 1990-1997 FLH-FLT, 3.24 1st Gear, Polished No Ear Door, N1 Shift Pattern
      DD6-411-03 DD6 Builder's Kit, 1990-1994 FXR, 1990-1997 FLH-FLT, 3.24 1st Gear, Black No Ear Door, Standard Shift Pattern
      DD6-411-03-N1 DD6 Builder's Kit, 1990-1994 FXR, 1990-1997 FLH-FLT, 3.24 1st Gear, Black No Ear Door, N1 Shift Pattern
      DD6-411L-02 DD6 Builder's Kit, 1990-1997 Softail, 1991-1997 Dyna, 3.24 1st Gear, Polished w/ Ear Door, Standard Shift Pattern
      DD6-411L-02-N1 DD6 Builder's Kit, 1990-1997 Softail, 1991-1997 Dyna, 3.24 1st Gear, Polished w/ Ear Door, N1 Shift Pattern
      DD6-411L-03 DD6 Builder's Kit, 1990-1997 Softail, 1991-1997 Dyna, 3.24 1st Gear, Black w/ Ear Door, Standard Shift Pattern
      DD6-411L-03-N1 DD6 Builder's Kit, 1990-1997 Softail, 1991-1997 Dyna, 3.24 1st Gear, Black w/ Ear Door, N1 Shift Pattern
      DD6-411P-02 DD6 Builder's Kit, 2001-2006 FLH-FLT, 3.24 1st Gear, Polished No Ear Door, Standard Shift Pattern
      DD6-411P-02-N1 DD6 Builder's Kit, 2001-2006 FLH-FLT, 3.24 1st Gear, Polished No Ear Door, N1 Shift Pattern
      DD6-411P-03 DD6 Builder's Kit, 2001-2006 FLH-FLT, 3.24 1st Gear, Black No Ear Door, Standard Shift Pattern
      DD6-411P-03-N1 DD6 Builder's Kit, 2001-2006 FLH-FLT, 3.24 1st Gear, Black No Ear Door, N1 Shift Pattern
      DD6-411PL-02 DD6 Builder's Kit, 2000-2006 Softail, 2001-2005 Dyna, 3.24 1st Gear, Polished w/ Ear Door, Standard Shift Pattern
      DD6-411PL-02-N1 DD6 Builder's Kit, 2000-2006 Softail, 2001-2005 Dyna, 3.24 1st Gear, Polished w/ Ear Door, N1 Shift Pattern
      DD6-411PL-03 DD6 Builder's Kit, 2000-2006 Softail, 2001-2005 Dyna, 3.24 1st Gear, Black w/ Ear Door, Standard Shift Pattern
      DD6-411PL-03-N1 DD6 Builder's Kit, 2000-2006 Softail, 2001-2005 Dyna, 3.24 1st Gear, Black w/ Ear Door, N1 Shift Pattern
      DD6-411S-02 DD6 Builder's Kit, 1999-2000 FXR, 1998-2000 FLH-FLT, 3.24 1st Gear, Polished No Ear Door, Standard Shift Pattern
      DD6-411S-02-N1 DD6 Builder's Kit, 1999-2000 FXR, 1998-2000 FLH-FLT, 3.24 1st Gear, Polished No Ear Door, N1 Shift Pattern
      DD6-411S-03 DD6 Builder's Kit, 1999-2000 FXR, 1998-2000 FLH-FLT, 3.24 1st Gear, Black No Ear Door, Standard Shift Pattern
      DD6-411S-03-N1 DD6 Builder's Kit, 1999-2000 FXR, 1998-2000 FLH-FLT, 3.24 1st Gear, Black No Ear Door, N1 Shift Pattern
      DD6-411SL-02 DD6 Builder's Kit, 1998-1999 Softail, 1998-2000 Dyna, 3.24 1st Gear, Polished w/ Ear Door, Standard Shift Pattern
      DD6-411SL-02-N1 DD6 Builder's Kit, 1998-1999 Softail, 1998-2000 Dyna, 3.24 1st Gear, Polished w/ Ear Door, N1 Shift Pattern
      DD6-411SL-03 DD6 Builder's Kit, 1998-1999 Softail, 1998-2000 Dyna, 3.24 1st Gear, Black w/ Ear Door, Standard Shift Pattern
      DD6-411SL-03-N1 DD6 Builder's Kit, 1998-1999 Softail, 1998-2000 Dyna, 3.24 1st Gear, Black w/ Ear Door, N1 Shift Pattern
      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.

      DD6 Bearing Doors

      DD6 vs. Stock 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 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.


      DD6 Gearset Layout

      Gears and Shafts Design


      DD6 Shift Forks

      Shift Forks
      Our shift forks are made out of billet steel 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)

      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
      1st Gear 3.77
      2nd Gear 2.56
      3rd Gear 1.87
      4th Gear 1.44
      5th Gear 1.15
      6th Gear 1.00

       

       

       

       

       

       

      Effective Ratios 
      1st Gear 3.24
      2nd Gear 2.20
      3rd Gear 1.61
      4th Gear 1.24
      5th Gear .99
      6th Gear .86

       

       

      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.

      Recalibration Box PN 95E-56B

      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

      Shipping Notes
      • Free Standard Shipping on $100+ Orders to the USA.
      • Except Preorder products are shipped in 48 hours.
      • Delivery to the USA:
      1. Standard Shipping : 3-10 business days
      • If time is of the essence, please consider selecting expedited delivery for faster service.
      Exchange/Return Notes
      • We offer a 30-day return/exchange service after receiving.
      • Final sale items are not eligible for returns or exchanges.
      • To process your return/exchange, please contact us at [email protected]
      • Please click here for more details>>> Return & Exchange Policy
      SKU: 37409599756

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      Tracy Vargas
      Carnegie, US
      ★★★★★ 4
      Great for chewing but very sharp and mangled in a few days
      Color: Blue Gator, Size: 1 Count, Color: Blue Gator, Size: 1 Count
      I thought this was a fantastic idea having baking soda added for fresh clean teeth while enjoying a new toy. I wanted to review 2 main things about this. First, if my dog enjoyed this toy. That answer would be yes absolutely! She is chewing it as I’m writing this right now. She can spend a good amount of time chewing away on this and it keeps her busy without having to use a rawhide treat which we only try to use if we re going to be gone for longer then 4 hours. The kids love playing fetch with her and she stays engaged the whole time. It is very heavy and when being thrown can become a weapon so I always supervise! Last, the durability of the toy. So it is durable but not completely. As you can see the toy got very sharp where she has been chewing it and I’ve even noticed a little blood on it which means it’s cutting her gums. It wasn’t a large enough amount for me to take it away. It is still almost the exact same size but maybe after a month I will re edit this for more accurate on durability since it’s only been about a week that she has gotten it. Overall, I would recommend this toy it’s a great price and keeps her attention a lot more then other toys I spent twice the amount of money on!
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on March 9, 2022
      C
      Verified Purchase
      CoCo
      Omaha, US
      ★★★★★ 3
      Too Hard
      Color: Blue T-Bone, Size: 1 Count
      I have a pit puppy, 20 lbs, who loves to chew. She's huge for her age, and I wanted to get her a new toy. I bought two different toys, hoping she would like one. The other toy was a hit, they both jumped at it and were excited about it, probably because it had rawhide rings that went with it. This one was immediately thrown to the side, even though my pit loves to chew on non edible toys. I think this one was just too hard, because both her, and my Chihuahua-Jack Russell, weren't interested. It didn't have any smell to attract them, which is why I bought it, because they love peanut butter stuff. I'm not going to go as far as to lick it and taste it... I'm pretty sure it won't taste like peanut butter, either. I feel so bad for my little pittie, she's just sitting here with a sad look on her face because my other dog stole the fun chew toy. I've immediately ordered another of one of those so they both have one, but I've just money wasted on this one. It's probably better they don't like it, I'd be worried about them breaking their teeth. I know it's supposed to be for power chewers, but it has no give whatsoever, just extremely hard, shiny plastic. It's useless, unless you're planning on filing it into a point and making a prison shank. Maybe you can leave it in front of the fridge for your SO to step on in the middle of the night when he goes to steal your almond milk. I'll figure out some way to use it. I did dip it into my boyfriend's peanut butter jar to let my puppy lick it, but I can do that with a spoon. I wanted her to feel like she got something, maybe my other dog will let her have a turn with the fun toy after awhile. That's the only reason I gave it 3 stars. You can dip it in peanut butter and I was being generous.
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on March 27, 2022
      R
      Verified Purchase
      Robert D Fry
      Battle Creek, US
      ★★★★★ 5
      Can become brittle with sharp edges with use.
      Color: Blue T-Bone, Size: 1 Count
      Our little dog loved chewing this, however after chewing the toy became jagged and brittle with sharp edges that cut into her upper lip which took about 2 weeks to heal. Unfortunately the return window had closed.
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on March 10, 2026
      A
      Verified Purchase
      Amy Bagby
      Omaha, US
      ★★★★★ 5
      Busy bone
      Color: Blue T-Bone, Size: 1 Count, Color: Blue T-Bone, Size: 1 Count
      My dog loves these!! Great busy bone! And they can hold it with her paws really well. It does kill your foot if you step on it barefoot in the middle of the night. This is a picture of the bone after 7months.
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on June 1, 2026
      A
      Verified Purchase
      Arleen K. Olson
      Lake Worth, US
      ★★★★★ 5
      My Dog Loves this!
      Color: Blue T-Bone, Size: 1 Count, Color: Blue T-Bone, Size: 1 Count
      My dog loves her Nubbies! My Dog chews her Nubbie every morning after she has her breakfast. She sometimes wants my husband or I to hold it for her while she chews on it. I think it is really good for her teeth and gums. These last a few months for our dog who chews it every morning. After a few months the edges get a little rough from all the chewing so I throw it out and replace with a new one. These are very reasonably priced, so I always have a fresh one ready to go. She gets very excited when we get a new one out of the package..
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on September 5, 2025

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