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Old 06-21-2015, 07:27 PM   #4
Mike C
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Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,709
Re: Rear end troubles

It's because the pinion nut has come loose either presently or in the past. When you accelerate, the pinion is pushed towards the front of the truck, when you decelerate, it is pulled towards the case and if the nut is loose, the pinion eats into the case.
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