They also put in an additive to help. I believe it has to do w/ the differential clutch packs being too tight. I have to take mine back again for a second time 
Clunking differential when cold
Thread Starter
Racer
Joined: Nov 2005
Posts: 315
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Clunking differential when cold
Until I've driven a couple of miles, I hear a clunking in my differential when I back up or just pull off from a stop. After warm up, this condition stops. Anyone else with this situation? Fix?
Thread Starter
Racer
Joined: Nov 2005
Posts: 315
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Pro
Joined: Mar 2007
Posts: 585
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From: Coral Springs Florida
Instructor
Joined: Jan 2006
Posts: 246
Likes: 4
From: Denton County Texas
Important: DO NOT add any limited-slip additive (friction modifier). With this new fluid (Dexron LS Gear Oil 75W-90) it is no longer required to add friction modifier. If friction modifier is added, it will cause the fluid to lose some of it's friction reducing properties as well as reducing seal life.
Fill the differential with the new DEXRON® LS gear oil, P/N 88862624 (Canadian P/N 88862625).
Fill the differential with the new DEXRON® LS gear oil, P/N 88862624 (Canadian P/N 88862625).
Thread Starter
Racer
Joined: Nov 2005
Posts: 315
Likes: 0
Thanks for all the advise. I spoke with my Service Manager and he told me to bring it in and get the latest fluid. He also said that in some cases, it requires two fluid changes to get all the noise out. He'll change it, let me drive 10 miles and then if necessary change it again. Nice to have a service manager that works with you.
PHOTOSHOP SPECIALIST
Joined: Aug 2007
Posts: 16,433
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St. Jude Donor '07-'08-'09-'10-'11-'12-'13-'14-'15-'16
Below is the updated TSB on this condition that utilizes the new DEXRON® LS Gear Oil 75W-90, P/N 88862624.
Last edited by *FAÇADE*; Nov 30, 2008 at 12:51 PM.
Team Owner
Joined: Dec 2002
Posts: 32,074
Likes: 296
From: San Francisco CA
Important: DO NOT add any limited-slip additive (friction modifier). With this new fluid (Dexron LS Gear Oil 75W-90) it is no longer required to add friction modifier. If friction modifier is added, it will cause the fluid to lose some of it's friction reducing properties as well as reducing seal life.
Fill the differential with the new DEXRON® LS gear oil, P/N 88862624 (Canadian P/N 88862625).
Fill the differential with the new DEXRON® LS gear oil, P/N 88862624 (Canadian P/N 88862625).
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