• JHM 4:1 Center Diff Upgrade SHIMS ONLY for 01E Manual Transmission - LATE
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JHM 4:1 Center Diff Upgrade SHIMS ONLY for 01E Manual Transmission - LATE Zoom

JHM 4:1 Center Diff Upgrade SHIMS ONLY for 01E Manual Transmission - LATE

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SKU: JHM-01EshimsLATE

$99.95

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For Manual Transmissions Only 

NOTE: PROFESSIONAL INSTALLATING HIGHLY RECOMMENDED. WE ARE OFFERING THESE SHIMS SEPERATELY DUE TO DEMAND. THESE SHIMS DO NOT COME WITH A WARRANTY UNLESS YOU PURCHASE OUR 4:1 DIFF UPGRADE DUE TO THE INCREASED CHANCE OF INSTALLATION ERROR. 

NOTE: THESE SHIMS ARE PRECISION MACHINED AND HARDENED AND EXCEED OEM QUALITY. USING STANDARD WASHERS OR SHIMS YOU FIND ON THE INTERNET IS A SURE WAY TO DESTROY YOUR EXPENSIVE DIFFERENTIAL.

The factory torsen center differential in the S4 provide a 2:1 torque distribution between front and rear. What does this mean? This enables the end of the car that still has traction (most of the time the rear) to deliver double the torque to the tires with traction. Our experience has proven that this closer to even distribution is best for drag racing. So this modification is not for you if you are into drag racing primarily. However for Auto Crossers, Road racers and others who prefer the twisties JHM recommends a bias ratio of 4:1. This is the same bias ratio that Audi has provided in the stock RS4 driveline.

 

So if you are tired of going through corners while using a lot of throttle and still getting "understeer" then this product is for you and will help you get a little more "oversteer" and allow you to drive the car a little more like a RWD car but still have the superior control of AWD.

 

 

NOTE: For 6-speed (01E) transmissions: We can only perform the FULL modification on the T2 style differentials originally equipped in 2000 and newer B5 S4s, C5 A6s, C5 Allroads and B6 A4 (3.0L only, 02-early 03). These T2 diffs have one of the following PNs on the outer case; 01E 409 751 E or 01E 409 751 F. Some of the pre 2000 diffs may be T2 diffs and have these part numbers as well. For those the full modification could be performed. If your diff is older and does not have one of these part numbers or has NO part number at all then it is most likely a T1 style diff. If you have a T1 we can only modify half of the diff due to its older design so you will not get a full 4:1 diff, it will be somewhere in between a 2:1 and 4:1. We won't know 100% for sure until we disassemble the diff if your diff does not have one of the part numbers listed above. Some of the older diffs have been replaced over the years from other cars or due to wear so there is no other way to tell until we receive your diff and disassemble it.

 


01E - 6-speed LATE OEM PN 01E409751F = B5 S4 (all), C5 A6 (all), C5 Allroad (all), B6 A4 6-speed (02-03 3.0l V6 only all other 6-speed A4s have the 02X) - See note above regarding older 01E diffs

 

INSTRUCTIONS: 
--Here is a write up on how to perform the install on a B6/B7 S4. It will help with other models since the general idea is the same. Check it out --> HERE 
--Here is a new write up on how to perform the install on a B6/B7 A4 with the 6-speed 02x transmssion. It will help with other models since the general idea is the same. Check it out --> HERE

 

NOTE: It is common with this mod to notice a slight chatter when making u-turns at low speeds. This is due to the modification to make it bias differently under power and at high speeds. Normal daily driving it is not noticeable.

 


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This product fits the following vehicles:
Make Model Chassis Engine
Audi S4 B5 (1997-2002) 2.7t V6 30v
Audi A6 C5 (1998-2004) 2.7t V6 30v
Audi A6 C5 (1998-2004) 3.0l V6 30v
Audi allroad C5 (2001-2005) 2.7t V6 30v
Audi A4 B6 (2002-2005) 3.0l V6 30v
Audi RS4 B5 (1999-2001) 2.7t V6 30v
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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.

Learn More: www.p65warnings.ca.gov

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Call Us:
209-968-0077

E-Mail Us:
sales@jhmotorsports.com

Find Us:
14150 S. Harlan Rd. Lathrop, CA 95330
General Infomation
© 2006 to present day JH Motorsports, Inc. All Rights Reserved.

JH Motorsports is not affiliated with or endorsed by Audi AG, Audi of America, Volkswagen AG, or Volkswagen of American or any other car company mentioned or whose logos are displayed in these web pages or our store. Audi®, Quattro®, Avant®, A4®, S4®, A6®, RS4®, RS6®, Allroad®, TT®, and Tiptronic® are trademarks of Audi AG. Volkswagen®, VW®, Golf®, Jetta®, Passat® and Beetle® are trademarks of Volkswagen AG. While we try to keep everything current, JH Motorsports is not responsible for errors in pricing on this web site. All prices are in US Dollars.

Some of these modifications and or parts are intended for off-road use only and may violate Federal or your State emissions standards. Also, end user assumes all risk with product performance and installation. JH Motorsports is not responsible for any bodily or mechanical harm, etc. as a result of use or misuse of any products.