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12 bolt???
Do you mean 14-bolt with G80? And if so, WHICH 14 bolt? Semi-float 9.5" ring gear, or full-float 10.5, or 11.5 ring gear?
The 14-bolt, semi-float 9.5" ring gear axle practically falls right into a 1500 that used to have the horrible 10-bolt 8.5" ring gear. You need new U-bolts, a conversion U-joint for the rear of the driveshaft. Get all the mounting plates with the axle, and grab the 6-lug axle from a 2WD or a 4WD "light duty 2500" truck to match your truck--they're different.