I had a medium pitch humming whine from under my car that I thought was a U joint or rear end. I disconnected the driveline at the rear end to isolate them and it turned out to be the rear end. It had a catch in it when turning.
The oil was not low in it either so it failed and I ended up getting a used one from a junk yard and my 0-60 time went down cause the ratio is higher than the old one. It is a LSD though.
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