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GN's did NOT have a 12 bolt. True, not all had the G80 (posi) but they were 8.5 instead of the smaller 7.5. No, the bolt pattern is not 5 on 5 but 4 3/4, just like most GM cars, and some did come with aluminun drums and posi. GNX! Best way to tell is to pull the cover.
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