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1988 C4. At slow speed turn to the right and on backing turns to the left I hear a knocking coming from the left rear. I don't hear anything on strait acceleration nor when driving over bumps. Only on slow speed turns. Is it a hub bearing or axle or???
1988 C4. At slow speed turn to the right and on backing turns to the left I hear a knocking coming from the left rear. I don't hear anything on strait acceleration nor when driving over bumps. Only on slow speed turns. Is it a hub bearing or axle or???
Sounds like the differential oil/grease friction modifier is warn out. This is a special limited-slip friction modifier available at most auto parts houses for about 12 bucks per pint.
A corrupt bearing, making a grinding or thumping sound, would make that sound going straight or turning and would also be audible at all speeds.