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DD7: Direct Drive 7-Speed Builder's Kit

The DD7 upgrades any existing 2006-later big twin 6 speed to a full 7 speed transmission.  The BAKER DD7 is more than just another gear added to the mix for the sake of one-upmanship. That 7th gear enables the motorcycle to now make full use, by way of gear ratio management, of the torque and power put out by the new 96 CI and 110 CI motors rolling off the assembly line in Milwaukee. We did not make this transmission a deep overdrive, rather we shortened 1st gear and tightened up the gears to deliver the riding experience that you were after when you bought your bike. The gear ratios leave you the rider, with the experience of smooth, crisp, continuously pulling acceleration from 1st all the way through 4th gear. Then you are able to start getting into the cruising portion of the program in gears 5th-7th. No big drops in RPM from one gear to the next or lugging the motorcycle off of a stop light, just smooth, uninhibited acceleration.

We did not stop at just fixing the gear ratios. We improved the smoothness and crispness of the shifting by reducing the mainshaft mass by only having 1st gear be a part of the shaft, rather than 1st-4th gears like on the stock unit. Reduction in rotating mass for shift quality is a fact that has been utilized in the automotive world for years. We ditched the stock detent arm and spring assembly from the door in favor of a Linear Detent that decreased friction while increasing smoothness when coupled with the all new shift drum design. We have tightened up the dog teeth on the gears to prevent the loud clacking noise that accompanies every shift on the factory 6 speed. Through the use of a billet bearing door, 28% wider bearings in the door, steel bearing retainer plates and full width gears, the durability and strength of our unit is a drastic improvement. By utilizing fully diamond ground, helical gears in 1st & 4th-7th we are able to deliver a much quieter riding experience. While 2nd and 3rd gears are diamond ground, spur gears to handle the peak torque that is reached in that range.

NOTE: To upgrade your older DD7 to the new Tapered Bearing style main drive gear bearing you must purchase PN 740-67. The current kit comes standard with the Tapered Bearing Kit.

  • Shorter first gear ratio (numerically higher) to help with the off the light get up and go, as well as slow speed maneuvering around the bar parking lot
  • Fully assembled gear set and shift system. No adjustments needed for installation
  • The DD7 includes a BAKER shifter pawl, new main drive gear bearing and seal, door, top and side cover gaskets
  • Compatible will all types of aftermarket hydraulic side covers, as well as the stock Screamin Eagle versions
  • Direct slide in installation. No case modifications needed. Clears all exhaust and works with all aftermarkets clutches
  • Included BAKER Direct Drive 7 Speed Stock Side Cover emblem
  • Backed by a 5 year limited warranty
  • Make full use of the late-model torque and power output
  • Experience of smooth, crisp, continuously pulling acceleration
  • No big drops in RPM from one gear to the next
  • No lugging the motorcycle off of a stop light
  • Easy to find neutral, every time
  • Smooth shifting without the the stock clunks or ‘jerks’ when engaging
  • Stronger torque capacity
  • Quieter
    • 2007-later Softail
    • 2007-later Touring: FL, FLT, FLH
    • 2006-later Dyna

    25 Tooth Drive Sprocket: Conversion of the stock belt drive to 530 Chain is the tried and true solution to address broken belts in performance applications. 2009-later requires retrofit to earlier non cush-drive rear wheel, or aftermarket wheel, to make wheel sprocket installation possible.
    PN 25T02-07

    Optional Cruise Drive Pulleys: Along with the launch of the Cruise Drive transmission on the 2006 Dyna models, the factory started using bigger diameter splines on the output gear. This change made us tool up 2 new pulleys to meet the tuning needs of our performance minded customers. Pulleys are available in 31 and 30 tooth configurations. *Note* 30 tooth pulleys require the use of the 139 tooth international belt available through any major aftermarket distributor.
    PN 30T-07 (30 tooth), 31T-07 (31 tooth)

    Shift System

    The shift drum utilizes many of the same features we have learned over the years, and incorporated into our other designs. Make the shift drum as light as possible, close tolerance design of the drum tracks matched with specific angles of the drum tracks ‘events'; make for smooth and positive shifting. Our specifically designed neutral position on the shift drum detent clover leaf make it easy to find neutral, every time. The close tolerance drum design paired with the gearset lay out, yields tight, repeatable dog tooth gaps that are not possible with mass production, cast shift drum designs used on the stock transmission.The linear detent, a design first used in the OEM car world. We were the first to introduce it to the V-Twin world on the Torque Box transmissions, and we have used it on the DD7 as well. It produces the lowest friction possible, with the controlled nature of using a coil spring in a strictly linear manner. The amount of precise control possible with a linear detent, can not be realized with the stock scissor spring and lever wheel detent design found on the stock gearset. All of these changes along with the billet steel machined, hard chrome plated shift forks, make it the smoothest transmission we have made to date.

    DD7 vs Stock Shift Drum

    Linear Detent Plunger


    The factory 6 speed has a 1 piece mainshaft with gears 1-4 machined out of one forging. This is easier and cheaper for high volume manufacturing, but yields a mainshaft that weighs over 5 lbs. This heavy one piece design is largely responsible for the clunk heard on every shift. This heavy rotating mass crashes into the gears on every shift. The DD7 has a 1 piece mainshaft (8620 steel) that only incorporates the small diameter 1st gear and weighs 3 lbs less than the stock unit. Whereas the stock gearsets utilizes a straight cut gear for 1st, and helical for 2-6, the DD7 uses straight cut 2 and 3rd gears, with the remainder being of a helical design. The largest amount of torque is put to the ground in 2nd 3rd gear, and straight cut gears handle that power the best. There is a not a lot of cruising going on in these gears, so the strength benefit of straight cut teeth outweighs the noise reduction factor inherent with a helical tooth design. The stock gears have tooth profiles that are cut on a shaper machine after heat treat, the BAKER 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. Further enhancements have been made to the male-female dog tooth pocket interactions, the tightened up radial gap on our design reduces the on-off throttle lag time and gear clunk noise found on the stock transmission.

    DD7 Gears vs Stock

    DD7 Gearset Layout

    DD7 Ratio Stock Ratio
    1st Gear 3.76 1st Gear 3.34
    2nd Gear 2.75 2nd Gear 2.30
    3rd Gear 2.06 3rd Gear 1.71
    4th Gear 1.55 4th Gear 1.41
    5th Gear 1.27 5th Gear 1.18
    6th Gear 1.10 6th Gear 1.00
    7th Gear 1.00 7th Gear N/A

    Bearing Door Assembly

    The stock bearing door is cast aluminum, the DD7 door is machined from virgin billet 6061-T6 aluminum.  Billet is stronger and this instance is no different. The stock gearset’s cause a phenomenon we call ‘Ghost Lever’.  Starting from low RPM’s in 2nd or 3rd gear go right to WOT and then get off the throttle.  Watch the clutch lever walk in and out from the handlebar. This is the shafts in the transmission walking left and right in the case due to the flex of the bearing door and the skinny stock door bearings. We use 28% wider roller bearings in the door and used a cold rolled 1045 steel plate to hold them in place, rather than the stock snap rings. No more Ghost Lever and much more power (up to 160 ft-lbs) can be thrown at it without the bearings breaking a sweat.


    DD7 vs Stock Door

    DD7 vs Stock HD Door Assembly, Section View

    PN Description Fitment
    DD7-37601 DD7 Builders Kit, Polished Door 2006-Later Dyna, 2007-Later Softail/ Touring
    DD7-37603 DD7 Builders Kit, Wrinkle Black Door 2006-Later Dyna, 2007-Later Softail/ Touring

    Fitment Note: Cruise Control will only work in 7th gear and the Red Line will be 5200 RPM with the DD7 on Throttle-By-Wire bikes equipped with stock ECM’s. No other motorcycle functions are affected in these instances. The 6th gear indicator light will come on when the DD7 is shifted into 7th on all models and all ECM’s. Aftermarket tuners such as Daytona Twin Tec and TTS-Mastertune will allow cruise to function in all gears, like stock, on Throttle-By-Wire bikes when coupled with the DD7 gearset. Dynojet can also flash your stock ECM to adjust the cruise control the cruise and red line, while still allowing the ECM to work with piggy back units like Power Commander. Any questions on this, please give our tech line a call. 

    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 DD7 Fluid Capacity Dry: 30-32fl-oz
    • BAKER DD7 Fluid Capacity Wet: 26-28fl-oz

    Learn more about Spectro Performance Oils here:

    Installation Instructions

    Daytona Bike Week Installs

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



    Wrinkle Black

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


    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.


    BAKER™ transmission assemblies and transmission builder 's kits, 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, whichever occurs first. All other BAKER products 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, except for the following; Warranty does not cover clutch plate wear, throw out bearing failures or mainshaft breakage due to improper clutch nut installation.Electrical components carry a 30-day warranty; cosmetic finishes (chrome plating, hard anodizing, powder coating) are covered for 60 days. Certain promotional products may carry a shorter warranty as specified at the time of purchase. 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 purchase invoice. If after evaluation by BAKER a defect in materials and/or workmanship is found, BAKER will, at their option, repair or replace the defective part of the assembly.


    Returns are permitted within 90 days of the delivery date. 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.


    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 manufacturers 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.

    DD7: Direct Drive 7-Speed Builder's Kit
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    DD7: Direct Drive 7-Speed Builder's Kit Direct-Drive 7-Speed for 2006-up Harley-Davidson motorcycles Direct-Drive 7-Speed for 2006-up Harley-Davidson motorcycles DD7: Direct Drive 7-Speed Builder's Kit DD7: Direct Drive 7-Speed Builder's Kit DD7: Direct Drive 7-Speed Builder's Kit
    Customer Reviews
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    • American
    David B.
    United States
    • What model motorcycle do you ride? Harley CVO Ultra Classic

    Great Transmission

    This is a great transmission. I haven't had time to put many miles on it yet but having less RPM loss between gears is nice. Also the lower first gear is nice that you don't have to lug it when starting out from a stop.

    Kiel K.
    United States United States
    • What model motorcycle do you ride? 2008 Road Glide

    Owlhead Garage Sicamous uses Baker to enhance customer experience

    Our customer was in need of more horse power and to keep his bike unique and top of the class. We looked no further than Baker’s DD7 line.

    BAKER Drivetrain DD7: Direct Drive 7-Speed Builder's Kit ReviewBAKER Drivetrain DD7: Direct Drive 7-Speed Builder's Kit ReviewBAKER Drivetrain DD7: Direct Drive 7-Speed Builder's Kit ReviewBAKER Drivetrain DD7: Direct Drive 7-Speed Builder's Kit ReviewBAKER Drivetrain DD7: Direct Drive 7-Speed Builder's Kit Review
    Patrick H.
    United States United States
    • What model motorcycle do you ride? 2011 Road Glide

    75,000+ miles and still going strong

    I purchased the very first DD7 sold to the public from Baker Drivetrain at Sturgis. Less than a year later they made a design change. Burt had me send him the trans, sent it back with the upgrade and had it reinstalled on his dime! When I traded in my 07 I had them install the DD7 in my 2011. Quality American made products with exceptional customer service! You can’t do better than Baker Drivetrain!

    BAKER Drivetrain DD7: Direct Drive 7-Speed Builder's Kit Review
    Dennis R.
    United States United States


    The staff has been very helpful. The product is very well built a great improvement over stock.

    Canada Canada
    • What model motorcycle do you ride? 2008 Night Train

    Love the DD7

    First gear is a little slower than the stock transmission; good in tight areas like parking lots etc. Adds about 30 kph to my top end at the same rpm I was cruising at before installing the DD7, has inspired me to do a stage 4 this coming winter. I'm back in love with my bike. Coming out of the States it was a pricey venture but the results were worth it.

    Web Product ID: 5209656835
    Baker Drivetrain Team Illustration