sounds like play between the pinion gear and ring gear. Also could be some axel movement where they slide into and are cliped in the rear end. I would say that you should have a rear end shop look at it and advise.
"If you can leave black marks on a straight from the time you exit a corner till the time you brake for the next turn.......
Then, you have enough horsepower."
My 67 Camaro Time Line
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