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Aug 10, 2013 | 06:42 PM

#21

2012 coupe

Burning Brakes

Joined: Jun 2000

Posts: 913

Likes: 17

From: Chatsworth, Ga.

Dealer fix for 2005 vette

Quote:

Originally Posted by AV8TOR536

I recently changed my differential oil to Castrol Syntrax 75w90 for
limited slip diff,if my 05 sits for a couple of days it still growls and binds
for the first half block when i pull out of my driveway then its fine, should I add more
friction modifier?

Here is a Corvette Tech Tip for the 2005 - 2007 Corvette rear end oil change.

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). R

Parts Information:
Description: DEXRON® LS Gear Oil
Part Numbers:
88862624 (US-1 Quart)
88862625 (Canada-1 Liter)

Warranty Information
For vehicles repaired under warranty, use:

Labor Operation: F9709*
Description: Drain & Refill Rear Axle Fluid
Labor Time: 0.6 hr

* This is a unique labor operation number for bulletin use only. It will not be published in the Labor Time Guide.

© Copyright General Motors Corporation. All Rights Reserved.

Document ID# 2048181
2005 Chevrolet Corvette

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)

Aug 11, 2013 | 07:52 AM

#22

C66 Racing

Premium Supporting Vendor

Joined: Aug 2001

Posts: 5,364

Likes: 38

From: King George VA

Quote:

Originally Posted by 2005 coupe

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.

The reason for this is the Dexron LS has tons of additive already in it. To get after market fluids, which also have additive already in them, up to this level of additive, more than comes in them is needed.

The spring diff clutch plate clamping pressure on the C6 diff is higher than on the C5 and the plates are made out of different materials. I think the chattering problem that resulted caught GM by surprise as clearly the C6 came out well before Dexron LS. There were numerous TSBs while they developed the Dexron LS.