Share to FB

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


    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
    Move your mouse over image to zoom. Click to enlarge.
    Customer Reviews
    4.7 Based on 25 Reviews
    5 ★
    4 ★
    3 ★
    2 ★
    1 ★
    Customer Photos
    Write a Review Ask a Question

    Thank you for submitting a review!

    Your input is very much appreciated. Share it with your friends so they can enjoy it too!

    Filter Reviews:
    • parts
    • bike
    • Guys
    • quality
    • everything
    • transmission
    • 2007
    • bearings
    • upgrades
    • people
    United States United States
    • What model motorcycle do you ride? 2011 cvo street glide

    Fit and feel

    Parts went in as designed, feels smooth and no more fluid leaking from main shaft seal. After a few thousand miles.

    BAKER Drivetrain Factory 6-Speed Tapered Roller Bearing Kit Review
    Mark W.
    United States United States
    • What model motorcycle do you ride? 2014 Street Glide with built 117" ...ported 110 heads , 58mm ,635HO cam

    Best upgrade for any high powered Harley

    if you've done any upgrades to the motor of your Harly should and will need to upgrade the transmission very soon !! what better way than with a proven product from people who totally understand the gear box of your bike ...this is by far way more feasible because of the quality of the bearings over the plastic stock ones ...just do it will not regret it ...very easy to install ..just take your time and get it right the first time !!!

    Mark W.
    United States United States
    • What model motorcycle do you ride? 2014 S/G Built 117" , Darkhorse crank and comp, 110 ported MVA heads ,58mm T/B, 630HO cams, Evo clutch etc...

    Best upgraded for the stock gear box

    If you've added any kink of power to your late model Harley ...why have you not done this upgrade yet you will need too very soon !!! Just do it ...and thank these guys at Baker later. Very ez to install, and much better Timkin style bearings...why better than the stock plastic stuff ...just take your time and do it right the first time and you will have no issues ...break it in with a few heat cycles and miles as with any new parts !!!

    Tom N.
    United States United States
    • What model motorcycle do you ride? 2007 Electra Glide Classic

    6 speed tapered roller bearings

    It was easy to install.. I have about a thousand miles on it. Everything is great! I appreciate the “quality” from Baker Drivetrain… Joker…WV

    Tim K.
    United States 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

    Web Product ID: 9847666510
    Baker Drivetrain Team Illustration