Have the rear end differential checked out as they are prone to pinion bearing & seal failure.

Listen for a humming in the rear(as a function of road speed). Mine used to sound like a fully laden B-17.

A factory rebuilt can be expensive.

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Patrick Leber
'84 190E 2.3
'83 Porsche 944 (track car)
'84 Porsche 944 (parts car)
85.5 Porsche 944 (sled)