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1990 C4 Diff Noise

Transmission and Clutch

Vehicle Information: Model: 964 C4 ; Year: 1990; Body Type: Cabriolet; Total Mileage: 135000;

I have noted that I have what I can only describe as a "howling" noise coming from the rear diff when I execute a hard turn in either direction. I tested the car in a parking lot and it seems that the noise increases as the radius of the turn decreases. The noise does not change as to temperature i.e. fresh start up or after 100 miles of driving. No clunks, no pops, just a sharp howl. Any ideas??????????

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