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High Torque Bearing Kit

The 34091-85 inner bearing race has been used on Big Twins since 1985. The inner primary bearing rides on this race. By design, this race press-fits onto the transmission mainshaft. This system works fine for stock engines. 100 HP+ engines will make this race walk on the mainshaft. If it walks inboard, it will damage the maindrive gear seal and cause a transmission oil leak. If it walks outboard, it will cause a primary oil leak. Our high torque bearing kit eliminates this condition. Kit includes a precision honed bearing and seal.

 PN 189-56

This part is now included in DD6 and OD6 kits.

  • 1985-2007 Big Twin Models


This part is now included in DD6 and OD6 kits.


Eliminates lateral walking of the mainshaft race, found especially found in high horsepower setups.

This part is now included in DD6 and OD6 kits.

Installation Instructions
Please refer to your Stock Service Manual.

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.

TERM AND CONDITIONS                                                                                         

  • 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, transmission kits, primaries, and oil pans 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. BAKER™ clutches, kicker cover kits, belt drives, F6F kit, reverse systems, covers and accessories 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. 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 invoice of purchase. If after an evaluation has been made by BAKER™ and a defect in materials and/or workmanship is found, BAKER™  will, at BAKER™  option, repair or replace the defective part of the assembly. 


Due to the uniqueness, low price and assembly outside of typical production process of products indicated as Insider Special products, purchasing these Insider Special products include a warranty so to guarantee the original purchaser to be free of manufacturing defects in materials and workmanship for a period of 1 year from the date of purchase or up to 12,000 miles. We have provided extended options for you to purchase below. 


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 charges. 


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 manufactures 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.

The words H-D®, Softail®, FXR®, Dyna®, FLT®, FLH®, Sportster®, and Buell® are registered trademarks and are for reference only.

High Torque Bearing Kit
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High Torque Bearing Kit High Torque Bearing Kit High Torque Bearing Kit
Customer Reviews
4.8 Based on 53 Reviews
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Filter Reviews:
Andrew V.
United States United States
  • What model motorcycle do you ride? 2006 fxdci
Inter primary bearing

Your bearing made it easy.

BAKER Drivetrain High Torque Bearing Kit Review
Malcolm U.
United States United States
  • What model motorcycle do you ride? 1956 Triumph TR6.
Excellent: I would definitely buy BAKER again.

Best customer service & fast delivery. You can't do better!

United States United States
  • What model motorcycle do you ride? Was 2017 CVO sreet glide
Fuck baker products

Not the first when I had to buy. All because I bought your transmission. I bought your transmission September 2020. I had a mechanic install your Baker garbage I made him open my motor three times and replace every bearing in it. Still with a knocking noise. Brought it to a different mechanic seven months later because I still do not have my motorcycle correct. He did everything in the primary site I replace everything twice. 10 months later here I am you guys replaced my transmission I got pulled for the first time after spending thousands of dollars chasing your problem your transmission problem you sent to me. So finally we pulled your transmission and that is been the problem the entire time. We sent it back to you you’ve replaced almost everything in it do not know why you did not just give me a brand new transmission of the shelf. God said transmission back new mechanic how to open my transmission and my primary two more times store with a sound. So I am $23,000 in debt because I traded my motorcycle in because your transmission

Rodger D.
United States United States
  • What model motorcycle do you ride? 1991 Harley FXLR & 1999 Fatboy both with Bakers OD6
Baker is the Best

Excellent Transmissions & Parts. Shipping was very fast and Item was the correct one.

United States United States

I wish they would emphasize that the oil seal is not the stock size. This way I can order it when doing a project. So far so good on the bearing. Only 10k miles

Web Product ID: 7419343491
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