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7.5 dia gear with a stock 10 bolt rear. all u need to know is if the rear is a 2 series carrier or a 3 series carrier. 2 series comes stock with 2.73 gears and 3 series comes with 3.23 or 3.42 gears.
Look in your glove box and see if you have a GU code. It's going to have a number after the GU. Look for the GM CODES thread I posted, and you will find what gear it is.