I've never heard of anyone having this problem in reverse only. I would start with the brakes first since it's the easiest to check out. Does your posi unit require the special friction lube? I've heard units make noises without the right lube in them, but it was never just in reverse.
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1964 Malibu SS, now a LS1 and T56, Back halfed, rollbar, narrowed 9 inch, 4.11 gears and 31x16x15 Mickey SSR's on Weld wheels.
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