Rotational noise in rear end

by Gord
(Fort Frances, Ontario, Canada)

Have an annoying rotational noise coming from the 3.55 differential on my 1978 Corvette, especially between 30-50 MPH. Had it rebuilt, and when I installed it I was happy the noise was gone. Then after about 50-100 miles or so the noise came back. So I assumed the rebuild was faulty, so I purchased a professionally rebuilt unit from I believe it was Zip or Ecklers. Installed the new unit. The noise was again gone initially and I was happy. Until 50-100 miles and the noise came back.

The noise is worse between 30-50 MPH and pretty much disappears under acceleration or deceleration and is loudest while cruising. It's also fairly quite initially when cold, but as you drive a few miles and it warms up the noise is louder.

Any ideas?

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