Always Red Dave

Can someone tell me what years of C6 vettes can be affected with the clunking rear end noise that needs a rear end diff. fluid change and bolts tourqed and then driven in figure eights. I am intersted in the YEARS of the C6 cars that are affected ONLY not the problem itself ,had the problem on my 2006 C6 and am wondering if all C6 cars are prone to the problem .Thanks guys by the way I have a 2008 C6....

KarlK

all of them

Mad*Max

you would have thought that they would have fixed the later year models from the factory

crusher1

I changed the fluid myself a year back and the clunk is gone

not08crmanymore

Yea,my 08 had it.Got the change covered under warranty!

seats1

Would've thought they'd fix the seats between 2004 and 2011, too...but they didn't.

boraxman

Me too

ping505

TSB: #07-04-20-002A
2005 - 2008.
Use only Dexron LS Gear Oil 75W - 90.

RJRSW

Here is the entire TSB:

"Document ID# 2048181
2005 - 2008 Chevrolet Corvette

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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)

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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).

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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 bent tip screwdriver, remove the quick connect fitting retaining ring (3) from the quick connect fitting (4) and discard the retaining ring.

4.2. Remove the differential cooler inlet pipe from the differential nut.

Drain the fluid.

Filling Procedure:

If not equipped with a differential cooler, install the drain plug (1) and washer (2) to the differential.
Tighten
Tighten the differential drain plug to 35 N•m (26 lb ft).

If equipped with a differential cooler:
2.1. Install a new retaining ring.

2.2. Connect the differential cooler pump inlet pipe (2) to the differential. A distinct snap should be heard or felt when assembling the cooler pipe to the fitting.

2.3. To ensure the cooler line is properly installed, give the cooler pipe a gentle pull.

Clean any dirt from around the differential fill plug.
Remove the fill plug and washer from the differential.
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). Refer to the table listed below for lubrication specifications.
Check the fluid level to ensure it is even with the bottom of the fill plug hole to no lower than 6 mm (0.25 in) below the opening.
Install the fill plug and washer to the differential.
Tighten
Tighten the differential fill plug to 35 N•m (26 lb ft).

Important: Steps 8-13 are for vehicles equipped with the differential cooling system. For vehicles not equipped with the cooling system, proceed to step 14.

Raise the vehicle so the wheels are about a foot off the floor. Make sure the wheels can spin freely without obstruction from the hoist or any nearby items.
Start the vehicle and put the transmission in second gear. Slowly accelerate to 10 mph and hold this speed for one minute.
Turn the vehicle off .
Raise the vehicle.
Check the fluid level in the differential. Add fluid until the recommended level is reached.
Lower the vehicle.
Once the differential fluid has been changed, the vehicle must be driven in 8-10 tight figure eight maneuvers to heat the fluid and allow the fluid to be worked into the clutch plates.
Lubrication Specifications Application
Quantity

Metric
English

2004-2005 XLR (Including Export) and 2005 Corvette (Non Export)
1.72 liters
1.85 quarts

2006-2008 XLR (Including V-Series and Export) and 2006-2008 Corvette (Non Z06)(Non Export)
2.0 liters
2.11 quarts

2005 Corvette Export
1.88 liters
1.99 quarts

2006-2008 Corvette Export (Non Z06)
2.16 liters
2.28 quarts

2006-2008 Corvette Z06
2.75 liters
2.91 quarts


Parts Information
Part Number
Description

88862624 (US-1 Quart)

88862625 (Canada-1 Liter)
DEXRON® LS Gear Oil

Warranty Information
For vehicles repaired under warranty, use:

Labor Operation
Description
Labor Time

F9709*
Drain & Refill Rear Axle Fluid
0.6 hr

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


GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION


© Copyright General Motors Corporation. All Rights Reserved."

cmonkey713

I changed mine myself on my '07 last spring. No more "clunking".

Always Red Dave

THANK YOU guys vey helpful INFO!

not08crmanymore

and remember,no additive needed with the newer fluid!Very important!

DASHZNT

I am curious if this is covered under warranty, like a recall or something and also how do I go about requesting this at the dealer.. Thanx.

NT

MannyS

Covered under warranty. Be sure to take a printed copy of the tsb since many dealers will be clueless about resolving this issue.

RJRSW

It is not like a recall it is a TSB and only covered under warranty by GM if your car is still covered under the bumper to bumper warranty it is not covered under the 5/100 driveline warranty. If the dealer doesn't charge for it they will not be reimbursed by GM and will end up eating it.

My 2007 was not covered even though it only had around 3200 miles on it when I took it in a couple of months ago and still is covered by the driveline 5/100 warranty.

Cost me $135 for the differential fluid change and the dealer also took care of the axle torque TSB at the same time. Noises and jerking were gone immediately after the change was done.

Just make sure they do not add the friction modifier again or you will be right back at square one.

ohmy

where it says to:

"Clean any dirt from around the differential fill plug"

I would do this step myself, there is no way it would be done at the dealership...

Street Rat

I had 30,000 miles on my 2008 and no clunking. Changed the fluid and tightened the axel nuts at that time just as a precaution. It's out of warranty so I used Amsoil products. It was easy to do and still no clunks.

talon90

Karl is exactly correct. All of them are capable of producing the noise. If you understand the way that the lubrication is spread in the differential and inversely, the impact that the car sitting for weeks and months on end without driving will have on the fluid will be significant. The way to keep the car from making noise is to drive it. Leaving it sit will allow more time for the gear lube to simply gravity drain off the gears in to a puddle on the bottom and the longer it will take for the lube to get spread back around again once you get moving.

Chevy Cust Svc

If you PM me your VIN, I can see if there are any open recalls on it.

Thanks,
Laura
GM Customer Service

AtHomeSoda

I had my 06 fixed at the dealer in 06 for free, they just changed fluid... it has never clunked again.