Check the oil in the diff and look for the usual signs of wear... lots of metal filings.
The inspection/fill plug is just a 1/2" drive from memory. Stick your finger in the hole and if you don't feel wet stuff, top it up with diff oil until it leaks out of the hole.
Other culprit could be the universal joints on the rear prop-shaft, maybe even the front. At speed it is sometimes hard to tell where the noise is really coming from. Crawl under the car and give them a good shake. Shouldn't be much, if any, movement in the shafts. If it clunks, you got a problem.
Cheers, Paul.


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