hi,how do I tell if I have a posi.diff????

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1979 Corvette

My book says that all Corvettes after '72 had a limited slip, and almost all C3s before that did.  If it's a C3, it certainly has a limited slip diff.  (Limited slip = posi)

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"Let them that don't want none have memories of not gettin' any."
- Brother Dave Gardner

that's good news.cheers

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1979 Corvette

But just for fun, to test on any axle, jack up the rear of the car so both wheels are off the ground. Turn one wheel forward and watch the other wheel to see which way it spins as you turn yours. If it turns forward as well, you have limited slip, if the other wheels turns the opposite (reverse) you have an open type differential and your life will dull and boring. 

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My Christmas present to ME! Bought Sat 11-30-2013. 72, 350 4 spd, Silver with blue interior...Can't you just hear Pablo Cruz playing in the background?

Quick and easiest; do a short burn-out and take a look!  One or two tire marks on the road will solve the mystery.

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1973 BB 4-Speed Coupe Project Car

lol john,it's up on 4 axle stands at the moment

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1979 Corvette