[DaveOC]

Per the TSB:

Rear Axle Clunk and/or Chatter on Turns
Subject: Rear Axle Clunk and/or Chatter Type Noise on Turns (Drain/Refill Rear Differential Fluid)

Models: 2003-2010 Cadillac CTS (Including V-Series and Export)
2004-2009 Cadillac SRX (Including Export)
2005-2010 Cadillac STS (Including V-Series and Export)
2006-2008 Pontiac Solstice
2007-2008 Saturn SKY

Condition

Some customers may comment on a clunk and/or chatter type noise from the rear of the vehicle while making turns.

This condition may be worse on vehicles built prior to the 2008 model year. Carbon-faced clutch plates were introduced into production in the 2008 model year and have decreased the likelihood of the clutch plate chatter.

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. It is not necessary to flush the old fluid from the differential.

Drain and refill the rear differential with new fluid, GM P/N 88862624. Refer to the Axle Lubricant Change procedure in SI.

This new fluid includes a friction modifier already added with a different formulation that last longer and does not break down overtime.

Lubrication Specifications Quantity

Without Differential Oil Cooler
1.10 L / 1.16 qt

With Differential Oil Cooler
1.41 L / 1.50 qt


Parts Information

88862624 (US -1 qt)

88862625 (Canada - 1 L)

DEXRON® LS Gear Oil

 

[DaveOC]

Does that take a #55 torx socket? Going to do Linda's 07 vert pretty soon.

My service manual doesn't mention a socket size.

:dunno:

.