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Q: getting slight winning noise in cruse, stops in coast. on 2001 GMC Sierra 2500 HD

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rear end winning noise in cruse, noise stops when in coast. Oil just replaced at 70k no metal found. also what is a good repair manuel?
Thanks Jack
(1) Answer
Chilton makes a good manual. Hope your differential has been fixed by now. But if not most likely the pinion bearing is bad.