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Jack it up and spin one tire, if the other turns the other way you have a posi.SORRY, but i do believe if it turns the other way it 's non-posi, a posi would both turn the same direction[ tried many times at salvage yard] ,THE OPTION CODE is in glove box G-80 IS LOCKING DIFF.

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Q: Does a 1991 Chevy Silverado have a posi?
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