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G80 is the rpo for a posi rear axle.
GU2 is for 2.73s, you sure thats what you got?
If it is, and you want to upgrade to 3.xx gears, I do believe you will need a new carrier unit with the gears, not just gears.
honestly it would probably be cheaper to get another rear with the desired gears.
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87 iroc with the usual go fast stuff
heavier than your half ton.
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