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OK, this car which I love is starting to pi$$ me off. I read elsewhere about a rear axle grinding noise on cold start and I think I have it. In the morning when I back out of the garage there is a grinding noise from the rear that I do not experience the rest of the day. Anyone know of a TSB on this?
 

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I have 9500 miles on mine and I just started noticing this sound as well. I would love to know what is causing it before I take it in for service. It only happens when the car has not been moved for a couple hours and only in reverse. It appears to be getting worse so I will have to take it on Monday, would love any advice!
 

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yup, mine did the same thing... get it serviced.
 
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There are specific threads here that deal with this problem. It seems you have to have your dealer change out the oil in the rear pumpkin and put a different grade oil in. Most dealers are aware of this problem since 04.
OK, this car which I love is starting to pi$$ me off. I read elsewhere about a rear axle grinding noise on cold start and I think I have it. In the morning when I back out of the garage there is a grinding noise from the rear that I do not experience the rest of the day. Anyone know of a TSB on this?
 

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OK, this car which I love is starting to pi$$ me off. I read elsewhere about a rear axle grinding noise on cold start and I think I have it. In the morning when I back out of the garage there is a grinding noise from the rear that I do not experience the rest of the day. Anyone know of a TSB on this?
My '04 did it at 13K. I took it in and told the dealer about the noise. Seemed to be the posi since I only heard it when I turned the car (loudest in reverse). If I drove it straight back or straight forward there was no noise. I had a Ferrari that did the same thing and the answer was to change out the rear end oil and add a friction modifier.
When I explained the issue to the dealer he did just that, changed the rear end oil and put in a tube of GM friction modifier and, like magic, about 50 miles later . . . no noise!
 

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We had this problem on our '05 XLR and had it fixed with the procedure in the Cadillac bulletin "PIP# 3559" which addresses the matter. That was when the mileage was approximately 2,700. Now almost exactly a year later with the mileage at 4,700 the problem has reappeared just as it was before.

Guess we'll go through the rearend oil change / special lubricant addition thingy again. Anyone know if there's any newer information from Cadillac on the problem?

Best regards,
Ed and Sandra
 
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