id be hard pressed to think its the fluid causing your issue. its not a clutched posi unit like the old days. and you also dont need to add any friction modifier either. it will be good maintenance BUT if something iS wrong with your posi it will mechanical and fluid alone wont fix it. Good Luck!!! let us know how it turns out. and look around for any metal fillings bigger then a pensil tip if you find any that means your "posi" might be broken IF your still having issues with it?
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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