Quote:
Originally Posted by PatrickNJ
I had my rear end replaced and I still get the same noise slowing down (from 50 to 40 mph) I also get a growling-rumbling noise when accelerating from 40 to 50 mph. Going to take it back again.
With these similar problems that we have how can you tell that the problem is stemming from the rear end differential and not the transmission?
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I have heard of some owners having to have the rears replaced several times before they got a "quiet" one. Some report still having some "slight" whine.
As far as telling if it's coming from the rear and not the transmission... I am not sure while driving but with the service bulletins coming from GM, the symptoms indicate rear end issues. I would request changing the oil out and new synthetic oil with the friction modifier installed at the dealer be the first step to see if this quiets it down and if not then another change out would be next.
Having the car with it's back end of the ground while the car's gears are engaged while someone is listening to the rear with a stethoscope they will be able to narrow it down.
