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Pretty sure they were all TPI, probably a typo. But anyway for the posi look atthe rear diff and see if there is ametal tag on one of the bolts in the cover, if there is it is Posi (of course many get lost/removed). Otherwise if the RPO codes are there look it up, I think Posi is a G81 or G86 RPO code if memory serves. and then it will be with one of the other following RPO codes also for gear ratio
GU2 2.73
GU5 3.23
GU6 3.42 <----- not sure if it was available on an IROC
__________________
-Nick
9/11/01- Never Forget
2002 Pontiac Trans-Am WS6 # 206
Chasing 10's
469RWH/437RWTQ
11.05 @ 123
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