103k depending on what year its out of May or may not have a Zexel posi. All 3.42's in 4th gens were a posi unit, just need to make sure wich one and if its good. and its hard to tell with the back lash in the carrier to axle. but a good thing to do If possible is pull the cover and see any wear on the gears and check backlash. i can tell by feel. its harder for others. but if it bangs around and feels loosish id steer clear.
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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