: Groaning sound when turning right coming from pass side rear wheel

10-25-11, 06:06 PM
Driving me nuts as I can not see any rubbing on anything from being lowered and with aftermarket wheels.

can this be a diff issue? My 2009 BMW M5 had a similar noise on the same side in the rear and the dealer did some fluid and seal service.

what can you guys suggest I check here and anyone comment on this groaning noise?

10-25-11, 09:34 PM
^^^^^^^^^^ What he said....

10-25-11, 09:43 PM
Is it from a stop? Having the same problem. It's definitely the diff.

10-25-11, 11:22 PM
it only does it at low rolling speeds in local streets when making sharp right turns coming to and after a stop sign or traffic light. only when turning right under 10mph.

im going to call my service shop and try and have them change my diff fluid and see if this helps.

has anyone had this fixed by a dealer? What did they do?

10-26-11, 09:37 AM
Search is your friend!

#10-04-20-001B: Rear Axle Clunk and/or Chatter Type Noise on Turns (Drain/Refill Rear Differential Fluid) - (Apr 21, 2010)
Subject: Rear Axle Clunk and/or Chatter Type Noise on Turns (Drain/Refill Rear Differential Fluid)

Models: 2003-2010 Cadillac CTS, Sport Wagon (Including V-Series and Export)
2004-2009 Cadillac SRX (Including Export)
2005-2010 Cadillac STS (Including V-Series and Export)
Equipped with Limited Slip Differential (RPO G80)

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.

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.

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 fluid, GM P/N 88862624 (in Canada, 88862625). Refer to the Axle Lubricant Change procedure in SI.

This fluid includes a friction modifier already added with a different formulation that lasts longer and does not break down over time.

Without Differential Oil Cooler
1.10 L
1.16 qt

With Differential Oil Cooler
1.41 L
1.50 qt

Parts Information
Part Number

88862624 (US -1 qt)