OK, today I took the Z28 out in the rain and was fooling around and only the passenger side tire will spin. The weird thing is that my rear acts up and sometimes both will spin and at other times, only one will (the passenger one). Is my posi taking a crap? If so, what's the cheapest and most durable posi unit I can get. The car still has the stock 2.73 rear gears. Should I swap those out for something higher while Im at it? Thanks for the help guys.....

 

Try just changing the lube, and posi additive... that normally helps, most often the additive breaks down in X miles, and makes the symptoms that you describe.

 

Sorry, couldn't help it.

 

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