a little while ago, i bought a 85 trans am as a project car. didnt run so i have never driven it. yesterday i yanked the engine and tranny, and while i was disconnecting the driveshaft at the rear end, i decided to spin the tires by hand to see if i had posi. and thats where my worries started. i spun the pass. side tire about 6-8 times before the drvr side tire spun. the driveshaft was turning, so i dont know what to think. any ideas?
also, were all 9 bolt rears posi? (stupid question, i know, but i dont know too much ab borg warner stuff)

 

Sounds like the posi is wore out. As far as I know I think that all 9 bolt's were posi. There is a tech article on how to rebuild or make the posi tighter in the tech article section. Hope this helps.

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89 Iroc 350 TPI,
Forged pistions
Comp roller Cam .510 lift 230dur
Flowmaster exhaust
Dart Iron Eagle heads 200cc runners 64cc chambers
LT1 Intake and Injectors

87 Trans Am GTA 350 TPI
had engine fire
350 LT1 Intake, Dart Heads Comp Cam .510 lift at 220' int and 230' exh. Hooker super comp headers, Pro Built 700R4 trans
Flowmaster exhaust
LT1 Injectors
LT1 intake also if I can find one!!