Hey Fellas, I have had this for a while. When I first bought the car I thought it was normal.

Whenever I make Sharp Right or Left hand turns I get this loud
"BRRRRRRRRR" Sound coming from what appears to be the Positraction.

It's definitely somewhere near the rear wheels. I've been told it's normal, and I've been told to bring it in. None of these people have corvettes, so before I give in and let the dealers fondle my baby, I'd like to know if any of you have experienced this.

Thanks,

G

 

sounds like posi-chatter, get the diff fluid change with the proper fluid and additive. That should that care of it.

Subject: Rear Axle Chatter Shudder On Turns - keywords bind differential #PIP3559F - (12/06/2006)

Models: 2004 - 2007 Cadillac XLR
2006-2007 Cadillac XLR-V
1999 - 2007 Chevrolet Corvette, Corvette Z06


The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:

Rear axle chatter or shudder on turns on Chevrolet Corvette and Cadillac XLR.
Recommendation/Instructions:

1. Flush and fill the rear axle with synthetic axle lubricant GM P/N 89021677 (Canadian P/N 89021678) and appropriate amount of the friction modifier additive P/N 01052358 (in Canada 992694). See fluid amounts listed below.

Note 1: In some cases it has shown that a second flush procedure on a second repair visit will correct the chatter/shudder concern prior to replacement of the clutch packs.

Note 2: To properly flush the rear differential remove the left differential cover and get all of the old fluid out off the differential, wipe out the residue replace the cover o-ring and then reinstall the cover and fill with the appropriate amount of fluid and friction modifier additive.
2. If the complaint or the condition persists after the flush and fill, replace the right and left rear axle clutch packs following published service procedures.
3. After clutch pack replacement use synthetic axle lubricant GM P/N 89021677 (Canadian P/N 89021678). and the appropriate amount of friction modifier additive P/N 01052358 (in Canada 992694). See fluid amounts listed below.

Note 3: PRIOR TO INSTALLING THE FRICTION MODIFIER ADDITIVE FOR EITHER OF THE ABOVE REPAIRS THE BOTTLE MUST BE SHAKEN VIGOROUSLY FOR AT LEAST 1 MINUTE TO MIX THE ADDITIVE THOROUGHLY.
4. Once the axle fluid has been changed the car must be driven in 8 - 10 SLOW figure eights to work the fluid between the clutch plates.

Fluid capacity:

Model Year


Model


Differential Lube


Friction Modifier

2004-2006


Base XLR


1.69 qt (1.6L)


4 oz. (118 ml)

2007


Base XLR


1.95 qt (1.85L)


5 oz. (148 ml)

2006-2007


XLR-V Series


1.95 qt (1.85L)


5 oz. (148 ml)












1999-2005


Corvette ALL


1.69 qt (1.6L)


4 oz. (118 ml)

2006-2007


Base Corvette


1.95 qt (1.85L)


5 oz. (148 ml)

2006-2007


Corvette Z06


2.70 qt (2.55L)


6.4 oz. (190 ml)

Note 4: Export vehicles use 2.01 l (2.12 qt) synthetic axle lubricant GM P/N 89021677 (Canadian P/N 89021678) and approximately 150 ml (5.1 oz) limited-slip differential lubricant additive GM P/N 1052358 (Canadian P/N 992694).

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.


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.
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© Copyright General Motors Corporation. All Rights Reserved.
Document ID# 1876083
2003 Chevrolet Corvette

 

I just had my dealer fix that problem on my 04. They changed the clutch pack. Thankfully all went well with the repair. No more loud crunching and grinding noises while pulling into a parking space.

 

Awesome, thanks guys!
I've been out partying and enjoying my baby for the whole Christmas party stuff. Chicks say they don't care what kind of car I drive, but once they get in....well, they simply can't say NO! HahA!

On a lighter note, how much was the procedure approximately?

thanks.