Corvette V8-6.2L (2008)
Fluid - Differential: Customer Interest
Drivetrain - Vibration/Noise While Making A Turn/Accel
TECHNICAL
Bulletin No.: 07-04-20-002B
Date: April 14, 2010
Subject: Rear Axle Noise or Vibration When Making Turns or Under Hard Acceleration (Replace Fluid and/or Posi-Traction Friction Plates)
Models:
2004-2008 Cadillac XLR, XLR-V
2005-2008 Chevrolet Corvette
2006-2008 Chevrolet Corvette Z06
Supercede:
This bulletin is being revised to update the subject title and to add the differential disc kit replacement procedures. Please discard Corporate Bulletin
Number 07-04-20-002A (Section 04 - Driveline/Axle).
Condition
Some customers may comment about a noise or vibration condition coming from the rear axle. This condition can occur during turns or under hard
acceleration.
Cause
This condition may be caused by breakdown of the rear axle fluid or, on certain models, degradation of the posi-traction friction plate material.
Correction
Perform the following steps to correct this condition.
For 2007-2008 Cadillac XLR and Chevrolet Corvette Z06
Drain and refill the rear axle fluid. Refer to Differential Oil Replacement in SI. Use the DEXRON(R) LS fluid listed below. This fluid already contains
limited-slip friction modifier.
For 2006 Chevrolet Corvette Z06 and 2004-2006 Cadillac XLR, 2006-2008 XLR-V and 2005-2008 Chevrolet Corvette (base model/non-Z06)
1. Drain and refill the rear axle fluid. Refer to Differential Oil Replacement in SI. Use the DEXRON(R) LS fluid listed below. This fluid already
contains limited-slip friction modifier.
2. If the customer returns with the same condition, replace the posi-traction plates with the parts listed below. For replacement instructions, refer to
Ring Gear and Differential Housing Disassemble and Ring Gear and Differential Housing Assembly in SI.
Important
The listed replacement differential disc kits may contain a different number of friction plates than the vehicle was manufactured with. This is
part of the revised part number application and is correct.
Draining Procedure