HAD2HAV2

At 48,000 miles on my 07, my rear differential was making noises. Chevy dealer called for a total rebuild, seals and clutches,$500 worth of parts and $1100 worth of labor. I paid $100. Anyone had their C6 differential rebuilt?

peter pan

Glad the warranty worked and we are in ours, will see if it needs used

C7Joy

Woo, that's scary and I'll be out of my powertrain warranty soon! Glad you had it easy on your repair!

phileaglesfan

Didn't the 07 come with the 5yr/100k power train warranty? Even 5 years ago would be August 2006 which is about 1-2 months after the 07 model start going down the assembly line. If that is the case then go back and get your $100 back.

Walt White Coupe

I love it when people buy an extended warranty on parts that are already under warranty. And the people that love it even more are the ones selling the extended warranty.

FloydSummerOf68

Was $1600 more than the cost of your warranty + $100 deductible? (Serious question)


with both.

Your car should've already been under factory warranty for that issue.

designerRob

Or it just needs a fluid change and the stealership is soaking GM for the big 'repair'.

HAD2HAV2

Thanks for the responces. Did some digging in the Warranty Assistance Information and found out on page 6 that my repairs should have been covered. Trying to get ahold of the Dealership as I write.

This extended warranty gave me a replacement car plus Low Jack. Have to look on the signing papers what the accual cost was for this combination.

Now for some reason I feel like a IDIOT for not doing my research better. I always thought I was intellegent. Will responed when I have my questions answered by the dealer. By the way, this dealer is big in Auto Racing, hint - hint.

mcandrew67

I guess they owe you $100

Gearhead Jim

I thought that only the late 2007's came with the 5/100 powertrain?
Either way, I'm glad he's covered.

FWIW, we "made money" with the GMPP on both our 2001 and then our 2006. Both had recurring electrical problems that took multiple tries and a lot of shop time to fix.

Like any insurance, it's a gamble.

MurphMan2

My 36 month b2b just ran out on the '08 a couple of days ago. I bought the GMPP 6 years, 60,000 miles, 0 deductible, Gold for $2500. I only have 7800 miles on it in 3 years so I doubt that I'll ever use up the miles.

I understand that some folks don't see the value in getting the GMPP but I look at it as simply an insurance policy for myself and an incentive to a buyer, if and when I sell it.

Walt White Coupe

MurphMan2,
It's your money but I'd rather have the money in the bank. Please come back in three years and let us know if you got anything for that one more year of coverage on the power train for $2500. Or for any other failure. The odds are against you.

RJRSW

My 2007 differential was making chattering noises, clunking and jerking in slow turns and all that it needed was the fluid change called for in the following TSB and an axle retorque and problems were gone.

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.

joeking

Mine did the same thing a couple weeks ago...started clicking and grinding on corners. I put two bottles of Royal Purple synthetic gear lube 75-90 and two bottles of GM friction modifier. The noise stopped immediately. UNBELIEVABLE! It is amazing how much noise those rear ends can make and be repaired with additives and new lubricant. Check around, there are hundreds of posts regarding this issue.

MurphMan2

Walt,
That's 6 additional years (August 2017) or 4 years after the factory 5
year/100k miles runs out.

I agree with you as to having the money in the bank but some people feel the same way about health/life insurance. I see posters for fund raising benefits for their survivors all the time.

Walt White Coupe

Murph,

Thanks for the clarification. Those people usually just can't afford health insurance. All insurance is written to benefit the insurance company, not the insured. If you are very wealthy even health insurance is a waste of money. It's all about how much the "potential" risk is and can you afford to accept it. The way I look at it there isn't much that can go wrong with my car that if I pay to get is fixed is going to affect my lifestyle one way or another. Some people buy extended warranties on a $40 electric toothbrush. Now a Corvette isn't an electric toothbrush but the cost to repair versus the cost of car is still relatively small.

HAD2HAV2

Glad to report that the Chevy dealership is crediting me back the $100 thanks to my good friends here. What caused me to whip out the warranty card(it's the private dealership card which is cheaper than GM's) is I was told I would have to pay for a rear end fluid change and to check the stablizer bars front & rear even though there is a TBS on both. My quess, using the card would pay for itself here. Paying for TBS related issues, am not sure that was true. I received a loaner car, a Prius (scary) that my std 5 year warranty would not do for free.

All ended well and if my CD player(non-Bose) dies again in the next 3 years then it will have been worth it. After that,C7 if there is one.

Thanks again. I feel better now.

traindude

Good thing you have the extended warranty!