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1992 968 Differential Whine

Transmission

Vehicle Information: Model(924/944/968): 968, 968; Year: 1992; Body Type: Coupe; Total Mileage: 89 K ;

Request guidance on the symptoms for pinion or other bearing wear in the 968 differential. My car has a subtle but constant whine above 35 MPH which is unaffected by clutch in or out, gearing, acceleration or de-acceleration, etc. I feel I have eliminated tires, central tube, wheel bearings plus noise is very distinctive and is centered inside car over differential. I planned on fixing the car but friend recently bought a 1993 with pinion bearing fixed, but his car has a whine also, though not as loud as mine. Need help to make an informed decision as to fix now or is car okay to drive.

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