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On the IROC it is either an 9 or 10 bolt. 10 bolt is a 7.5oo" ring gear, i think the 9 is the 7.625" ring gear, not sure. Easiest way to tell is crawl under the car and count the bolts on the rear cover.
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-Nick
9/11/01- Never Forget
2002 Pontiac Trans-Am WS6 # 206
Chasing 10's
469RWH/437RWTQ
11.05 @ 123
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