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Factory 6-Speed Tapered Roller Bearing Kit

Heal your Achilles heel with the BAKER Main Drive Gear Bearing Kit for 2007-up Big Twins!


P/N 640-67

Kit includes

  • BAKER double tapered roller bearing assembly
  • Replacement HD main drive gear 
  • Replacement countershaft bearing


Main Drive Gear Bearing Kit Instructions

This kit provides everything you need to eliminate the all too common stock maindrive gear bearing failures. We include our exclusive BAKER double tapered roller bearing assembly, and a replacement cruise drive main drive gear.

Also available is a Transmission Rebuild Kit to go along with this double tapered roller bearing kit. P/N TRK-CD6-2


  • 2006 and later Stock Dyna 
  • 2007 and later Stock Softail / Touring

    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.

    Factory 6-Speed Tapered Roller Bearing Kit
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    Customer Reviews
    4.7 Based on 21 Reviews
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    Filter Reviews:
    • 2007
    • Baker
    • anyone
    • .108
    • American Modern Cycles
    • instruction
    • shim
    • video
    • customer bike
    • FLHT
    Tim K.
    United States
    • What model motorcycle do you ride? 2008 Eletra Glide Ultra Classic

    Trans rebuild

    Everything I purchased worked great together. Would say if you have the experience to do it. It is a great deal and great parts

    PETE M.
    United States United States
    • What model motorcycle do you ride? 2015 FLHXS

    Fitment issue

    DurriThe instructions were very detailed to get this product installed. The only issue I had was the correct spacer was not in the kit. I had to have one ground to get the appropriate endplay on the bearing per the instructions. I would like to see them add at least 1 more spacer to the kit thinner than the smallest one in the kit.

    Ryan D.
    United States United States
    • What model motorcycle do you ride? 2007 dyna super glide

    Best kit on the market

    Awesome product blows the doors off any other kit available highly recommend install was easy

    United States United States
    • What model motorcycle do you ride? Roadglides forever.

    All American cycle

    Have used your tapered 6 speed transmission set up in 2 of my big engine Roadglides. We also recommend that bearing set up to our customers.

    Don L.
    United States United States

    good stuff

    We've used several of them and they are our replacement of choice.

    Web Product ID: 9847666510
    Baker Drivetrain Team Illustration