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1993 968 Transaxle groaning sound

Transmission

Vehicle Information: Model(924/944/968): 968; Year: 1993; Body Type: Coupe; Total Mileage: 166,000;

Recently my car has developed a loud groaning sound at highway speeds. The noise starts at around 60mph and gets louder as you speed up and lessens as you decelerate. The "tone" definitely changes as you lift off and decelerate. This sound is definitely coming from the rear of the car. Sometimes it isn't that loud, and at other times it is loud enough to drown out the radio. Is this what I'm afraid of? I've never heard a bad pinion bearing before. I realize it's difficult for you to diagnose based on my commentary, but does this sound particularly obvious to you? Thanks for your help.

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