If luck is on your side it sounds like the front pinion bearing. Get the rear cover off and look for any signs of metal flakes in the oil. Do a disassemble of the differential looking at the races and bearings closely. Replace them as necessary. Make sure you use the correct synthetic oil upon completetion. As far as noises in rear axles go, it won't get any better by ignoring them.
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Mark Ruset 2048 STK
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