rear end chatter

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Aug 3, 2007 | 12:23 AM

#21

StarJack

Melting Slicks

Joined: Mar 2006

Posts: 2,255

Likes: 3

From: Sugar Hill Georgia

Quote:

Originally Posted by KarlK

My chatter is gone but I have this slight popping / clunking sound at low speeds, going straight over smooth or uneven surfaces. Sounds like a suspension bind, U-joint, differential back lash or ????

That does not sound good!

Sure you got all the pieces that may have broken off?

Aug 3, 2007 | 12:32 AM

#22

KarlK

Team Owner

Joined: Sep 2006

Posts: 67,022

Likes: 51

From: Beats UD regularly playing 3D chess, and at life

Quote:

Originally Posted by StarJack

That does not sound good!

Sure you got all the pieces that may have broken off?

pieces broken off?

There is no noise at speed, acceleration, etc. just from 5-30 mph or so.

This topic has been hashed out over on General for several weeks, several threads. Some say loose calipers, loose sway bars, some say dealerships can't pinpoint it, etc.

I've tightened every bolt in the rear, silicone sprayed every rubber bushing, check shock mounts, exhaust system and mounts, axle nuts, etc. noise is still there.

I'm reluctant to take mine in without a know fix.

Aug 3, 2007 | 12:48 AM

#23

StarJack

Melting Slicks

Joined: Mar 2006

Posts: 2,255

Likes: 3

From: Sugar Hill Georgia

Quote:

Originally Posted by KarlK

pieces broken off?

There is no noise at speed, acceleration, etc. just from 5-30 mph or so.

I'm reluctant to take mine in without a know fix.

Meant a small piece of the tip that you were using to add the fluid, but I think I misunderstood what you were describing, and I certainly agree with reluctance to take it in w/o knowing the fix. Hope you get it figured out.

Aug 3, 2007 | 02:10 AM

#24

knkali

Thread Starter

Melting Slicks

Joined: Jun 2006

Posts: 2,690

Likes: 1

From: Northern Calif

I was going to ask a question like was it lowered but I am sure you cover all that already to death.

Aug 3, 2007 | 08:17 AM

#25

KarlK

Team Owner

Joined: Sep 2006

Posts: 67,022

Likes: 51

From: Beats UD regularly playing 3D chess, and at life

Quote:

Originally Posted by knkali

I was going to ask a question like was it lowered but I am sure you cover all that already to death.

Yes I have it lowered but not down all the way on the factory blocks. I lowered it the second day I had it and for 1 1/2 years with no noise.

I even raised it up a little, no difference.

Aug 6, 2007 | 11:11 AM

#26

wsharp24

Burning Brakes

Joined: Oct 2006

Posts: 1,199

Likes: 0

From: Evans Georgia

Quote:

Originally Posted by knkali

did a bunch of tight turns and the noise is gone again.

Okay, makes sense now. I'm hoping that AMSOIL is the answer.

I hear that the 07s are having the same problem.
WTF does it take for GM to figure out this problem? I have heard that this has been a problem for over 10 years...GEEZ.

Fingers crossed for AMSOIL to be the true fix.

Aug 6, 2007 | 11:33 AM

#27

dtvet

Instructor

Joined: Jan 2003

Posts: 209

Likes: 0

From: VA

Has GM addressed these common issues in later 07's or 08's? Now I am concerned, since I just ordered an 08. . . . the last thing I need is another problem car. . .

Clutch issues
CAGs wiring issues
Rear differential seals leak issues
Differential chatter issues
Excess heat in console issues
Engine oil leaks
Roof's flying off issues
anything else?

Aug 6, 2007 | 11:59 AM

#28

carpe dm

Le Mans Master

Joined: Oct 1999

Posts: 8,205

Likes: 40

From: Tucson AZ

Quote:

Originally Posted by dave pawlowski

1. Would overfilling the diff case help? It would raise the lube level.
2. Other than the noise, is it really a problem? It seems to go away as soon as I drive a short distance.

Don't "overfill" the diff. Hard to do, but I suppose you could..... It will increase pressures and will wind up coming out the breather and making a mess.

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Aug 6, 2007 | 09:41 PM

#29

C66 Racing

Premium Supporting Vendor

Joined: Aug 2001

Posts: 5,364

Likes: 38

From: King George VA

Quote:

Originally Posted by wsharp24

I have heard that this has been a problem for over 10 years...GEEZ.

Fingers crossed for AMSOIL to be the true fix.

C5/C5 Z06 has had its fair share of diff problems, but not the same one's I'm reading about for the C6. Most C6 diff problems seem to be related to low speed, tight corner, clutch plate chatter, which is all but unheard of for the C5. The most common C5 problem seems to be a leaking left axle seal (which I had as well). I spend a lot of time on the GTO and CTS-V forums, and those cars seem to have diff whine as the major issue. Guess if it's not one thing, it's another.

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