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Change t-case gears - it's more beneficial than changing R&P.
Jack up both rear wheels (block front wheels, nuetral, and brake off on level surface)
grab a tire and spin it.
If they spin the same direction, it has a locker or "posi" in it.
(you would know if it had rear locker by driving it, clutch in tight turn you would here click,click,click,click).
If wheels spin opposite directions, it's an open dif.
Jack up both rear wheels (block front wheels, nuetral, and brake off on level surface)
grab a tire and spin it.
If they spin the same direction, it has a locker or "posi" in it.
(you would know if it had rear locker by driving it, clutch in tight turn you would here click,click,click,click).
If wheels spin opposite directions, it's an open dif.