Had a friend that had the same problem one time and his bolts were slowly backing out of his ring gear. Not saying that is your problem, just relaying another possibility.
I have also seen a car have that problem where the axles were changed and no one noticed it had a ford register instead of a chevy. When the wheels were bolted up they were not perfectly centered and it did the same as your car.
Stuff like what is going on will make you crazy. Good luck
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