Specifications

My Corvette Photos
Member Since: Sep 2004
Location: Long Island NY
calemasters):
Date: 01-09-2008
TSB: #07-04-20-002A
Document ID# 2048181
2005 - 2008 Chevrolet Corvette
Subject: Rear Axle Clunk and/or Chatter Type Noise
on Turns
(Drain/Refill Rear Differential Fluid) #07-04-20-
002A - (01/09/2008)
Models: 2004-2008 Cadillac XLR (Including V-
Series
and Export)
2005-2008 Chevrolet Corvette (Including Z06 and
Export)
This bulletin is being revised to change the fluid
recommendation and to remove the requirement of
adding friction modifier. Please discard Corporate
Bulletin Number 07-04-20-002 (Section 04 --
Driveline/Axle).
Condition:
Some customers may comment on a clunk and/or
chatter type noise from the rear of the vehicle while
making turns.
Cause:
This condition may be caused by slip/stick of the
posi-traction clutch plates due to insufficient
limited-slip axle additive. As plates slip and stick, a
jumping or jerking feel occurs accompanied by a
clunk noise.
Correction:
Important: DO NOT remove the differential cover
from the rear or the two sides. It is not necessary
to flush the old fluid from the differential.
Drain and refill the rear differential fluid using the
procedure listed below.
Draining Procedure:
Raise and support the vehicle. Clean any dirt from
around the differential drain plug. If not equipped
with a differential cooler, remove the drain plug (1)
and washer (2) from the differential.
If equipped with a differential cooler: 4.1. Using a