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Bearing noise?

Engine

Vehicle Information: Year: 1990 (C4); Body Type: Coupe; Total Mileage: 65000;

Just returned from long trip with car heavily loaded. Have new deep rotating harmonic noise in left rear end. Does not seem to be related to engine speed or a particular gear. Does not create a vibration and is not a scraping noise. Has almost a thump to it like a wheel balance thing but there is no vibration. In any event, it spoils all the nice normal noises back there. I would guess a cv joint or wheel bearing but was wondering if there is some specific part that fails at about this mileage in your experience. Thanks.

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