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Transmission Rebuild Kit, Complete 0B4 MT (JHM Performance-OEM), Seals and Synchros

SKU: JHM-OEM-0B4-TransKit


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IMPORTANT ABOUT BEARING FAILURE ISSUES ON THESE TRANSMISSIONS: These transmissions have 3 sealed ball bearings on the main and counter shafts that fail.  When they do they completely destroy most transmissions rendering them no longer rebuildable. Please check out our bearing kit OEM-0B4311965-Kit on our site and add to cart with this purchase. If you do not replace the bearings you run the risk of one of the bearings failing later and destroying your freshly rebuilt transmission.


This is a brand new standard Transmission Rebuild Kit for the 0B4 Transmission found in the B8 S4 and S5.   This kit included new OEM Components as well as JHM Performance 3-Piece Carbon Synchros for gears 3-6!  After extensive testing we found the OEM 1-2 synchros have not failed like the 3-4-5-6 so we upgraded those like we do with many other transmissions.


  • 4 x JHM Performance Carbon Synchros for gears 3,4,5 and 6
  • 1 x OEM Synchro for 1st gear
  • 1 x OEM Synchro for 2nd gear
  • 7 x OEM Selective snap rings for input shaft (we include all sizes so you can match to yours and eliminate downtime by measuring and then waiting)
  • 1 x OEM Mainshaft lockring
  • 1 x OEM Selector shaft seal
  • 1 x OEM Front right output shaft seal
  • 1 x OEM Front left output shaft seal
  • 1 x OEM Front differential cover O-ring
  • 1 x OEM Front case sealing cap
  • 1 x OEM Rear outupt shaft seal
  • 1 x OEM Sealing paste
  • 11 x OEM Rear diff housing bolts (one time use)


About JHM Performance Carbon Synchros:

We have been selling and abusing our JHM Performance Carbon Synchros since 2011. We have been putting them to the ultimate test to make sure they can handle all the abuse we throw at them. We have improved upon the OEM Design featuring an improved coefficient of friction VS OEM which will result in better high RPM shifting. Our oiling grooves will provide better cooling to the synchros increasing the durability making them longer lasting. Best of all, they cost less than OEM synchros making these an incredible bang for your buck, especially for your B8 0B4 Transmission. 


Click to enlarge picture 


Fits all 0B4 transmissions found in the B8 S4 and S5


Is your transmission going bad? Do you have synchro issues and gear crunching? Do you have trouble getting into gear? Is your shifter randomly popping out of gear? If you want to fix your transmission issues right the first time then this is the rebuild kit for you!

If you've got "crunching" while shifting or any of the symptoms described above, do not push the rebuild down the road and increase your costs when you finally rebuild the transmission. 

NOTE: Kits usually ship out from our location within 1 to 4 days depending on our current stock.


We also provide this rebuild service here at our shop in Lathrop, CA as well as selling fully rebuilt transmissions

For shipping quotes: Please sign in or join then put the items you want in your shopping cart and proceed to checkout.

This product fits the following vehicles:
Make Model Chassis Engine
Audi S5 B8-B8.5 (2008-2017) all
Audi S4 B8-B8.5 (2010-2016) 3.0t V6 24v SC
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You're reviewing: Transmission Rebuild Kit, Complete 0B4 MT (JHM Performance-OEM), Seals and Synchros
Off-road Use

By Purchasing any Off-Road use ONLY products from JH Motorsports, Inc. I acknowledge and understand the following disclosure. (This notice is located at the bottom of the page description of affected products on our website.)

Vehicle Code § 27156:
(b) No person shall operate or leave standing upon a highway a motor vehicle that is required to be equipped with a motor vehicle pollution control device under Part 5 (commencing with Section 43000) of Division 26 of the Health and Safety Code or any other certified motor vehicle pollution control device required by any other state law or any rule or regulation adopted pursuant to that law, or required to be equipped with a motor vehicle pollution control device pursuant to the National Emission Standards Act (42 U.S.C. Secs. 7521 to 7550, inclusive) and the standards and regulations adopted pursuant to that federal act, unless the motor vehicle is equipped with the required motor vehicle pollution control device that is correctly installed and in operating condition. No person shall disconnect, modify, or alter any such required device.
(c) No person shall install, sell, offer for sale, or advertise any device, apparatus, or mechanism intended for use with, or as a part of, a required motor vehicle pollution control device or system that alters or modifies the original design or performance of the motor vehicle pollution control device or system.

Health and Safety Code § 43000:
43001. The provisions of this part shall not apply to:
(a) Racing vehicles.

As the aforementioned code sections outline, it is against the law to operate or use a vehicle on public streets or highways with modified, altered, or disconnected motor vehicle pollution control devices. This may include but is not limited to, Evaporative Fuel Controls, Catalysts, DPF, PTOX, PCV Systems, Exhaust Gas Recirculation Systems, Oxygen Sensors, Thermostatic Air Cleaners, Air Intake Systems, Fuel Injectors, Regulators, Adjustable Cam Gears, ECU Programming, Mapping, or other Computer Modifications. Air Pumps, Air Injection, Timing, and any other Emission System Modification(s).

Purchaser acknowledges and certifies to JH Motorsports Inc., that Purchasers vehicle will only be used for racing applications or off road vehicle use only. Purchaser requests these modifications for the purpose of enhancing the vehicle for competitive Racing Applications and will not use this vehicle on public streets or highways. Purchaser agrees to indemnify JH Motorsports Inc., all employees, officers, owners, and subsidiaries for any civil or criminal liability arising out of use of Purchasers vehicle on public streets or highways as Purchaser has been duly notified of the laws and regulations regarding disconnecting, alteration, or modification of a vehicle’s pollution control devices. Purchaser understands and has been advised the driving of a vehicle on public streets or highways could result in criminal or civil penalties.

Prop 65

Warning: This product may contain a chemical known to the State of California to cause cancer, birth defects, or other reproductive harm.

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