The posi is supposed to slip so you can corner without ruining your tires. Make sure you have good lubricant in the rear end. I am not sure about this part, but I had a Jag that had limited slip and when the rear tires were up and you spun them they would both turn the same direction. I think the Supra's are that way too. If they spin opposite then there is no working posi or limited slip rear end, but I could be wrong about that. All I know is that after 190,000 miles, mine is still working and it does get used a few times.
Russ
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