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1996 Caprice Classic rear end rub a little and jumps barely while backing up

I noticed that, when my ’96 Caprice is backing up on smooth concrete, it kind of grinds and jumped just barely. Is it my gears in rear end? Any other issues could cause this?
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1answer
214 views

How do I check the fluid level in the rear end (differential) on a 1996 Caprice?

What is the procedure to check the fluid level in the rear differential? The RPO code for this particular rear end is G80.