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"Howling" is the word I think you wanted. I am no differential expert, but it sounds like your ring and pinion are not aligned correctly. It could be worn out or it might just need shimming. It is probably cheaper to swap out the rear than to fix it, but then you could be buying more problems. Try to find an expert to take a look.
The easy thing for you to do is pull the differential cover and take a look for yourself. Look for metal shavings, worn gears, and rust pits on the gears. It's a start.
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