rear differential noise
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Pro
Joined: Sep 2002
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From: trample the weak...hurdle the dead SC
rear differential noise
after 20 minutes of driving, it feels and sounds like the rear end is chattering .. mainly when I stop and begin to accelerate....does anyone have any ideas...I had the fluid changed and the posi-additive added last fall..but I think I'm borrowed time. Thanks in advance
Drifting
Joined: May 2002
Posts: 1,546
Likes: 5
From: Sacramento California
Put another bottle of posi additive in and go find a big parking lot, slowly start doing figure 8's back and forth. Do this about 10-12 times. This will turn the posi clutches and work the additive into the clutches.
It worked on mine.
It worked on mine.
Thread Starter
Pro
Joined: Sep 2002
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From: trample the weak...hurdle the dead SC
did yours start because of a particular reason or is doing figure 8's a process that needs to be done periodically?
Advanced
Joined: Sep 2010
Posts: 88
Likes: 0
From: Washington
I have been bothered by a grinding noise coming from the rear end of my 07 z51 a6 for a few months. I took my car to the dealer and they told me they thought it was the aftermarket exhaust I put on it. NO. Definitely not the right sound. 
I put Royal Purple differential oil in the rear about 8 months ago and no noise till recently. It was making terrible grinding noises when turning sharps corners in parking lots and getting worse when turning in general. I talked to Corvettes Of Auburn today and they told me to try the Dexron LS Gear oil WITH the friction modifier already in it, 75-90W. I just put it in and went and did figure 8's in a parking lot like I was instructed. The noise is COMPLETELY GONE
Would have never thought. I thought Royal Purple was the best. Apparently not. Its amazing how the sound travels through the whole car and makes it kind of hard to pinpoint. I originally thought the front wheel bearings were going out. I am a very Happy Vette owner!
I put Royal Purple differential oil in the rear about 8 months ago and no noise till recently. It was making terrible grinding noises when turning sharps corners in parking lots and getting worse when turning in general. I talked to Corvettes Of Auburn today and they told me to try the Dexron LS Gear oil WITH the friction modifier already in it, 75-90W. I just put it in and went and did figure 8's in a parking lot like I was instructed. The noise is COMPLETELY GONE
Would have never thought. I thought Royal Purple was the best. Apparently not. Its amazing how the sound travels through the whole car and makes it kind of hard to pinpoint. I originally thought the front wheel bearings were going out. I am a very Happy Vette owner!
SUBVETTE
Joined: Jul 2006
Posts: 3,841
Likes: 93
From: San Diego CA
I have been bothered by a grinding noise coming from the rear end of my 07 z51 a6 for a few months. I took my car to the dealer and they told me they thought it was the aftermarket exhaust I put on it. NO. Definitely not the right sound.
I put Royal Purple differential oil in the rear about 8 months ago and no noise till recently. It was making terrible grinding noises when turning sharps corners in parking lots and getting worse when turning in general. I talked to Corvettes Of Auburn today and they told me to try the Dexron LS Gear oil WITH the friction modifier already in it, 75-90W. I just put it in and went and did figure 8's in a parking lot like I was instructed. The noise is COMPLETELY GONE Would have never thought. I thought Royal Purple was the best. Apparently not. Its amazing how the sound travels through the whole car and makes it kind of hard to pinpoint. I originally thought the front wheel bearings were going out. I am a very Happy Vette owner!
I put Royal Purple differential oil in the rear about 8 months ago and no noise till recently. It was making terrible grinding noises when turning sharps corners in parking lots and getting worse when turning in general. I talked to Corvettes Of Auburn today and they told me to try the Dexron LS Gear oil WITH the friction modifier already in it, 75-90W. I just put it in and went and did figure 8's in a parking lot like I was instructed. The noise is COMPLETELY GONE
Would have never thought. I thought Royal Purple was the best. Apparently not. Its amazing how the sound travels through the whole car and makes it kind of hard to pinpoint. I originally thought the front wheel bearings were going out. I am a very Happy Vette owner!True. Straight Gear Oil without adding a friction additive is the latest fix recommended by GM in their last TSB for this problem (followed by the figure 8's).
Pro
Joined: Apr 2002
Posts: 538
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From: Astoria OR
