6-10 is front and rear recommended by GM and most aftermarket gears say 6-12.
Pinion Preload(New) Pinion Preload(Reused) Ring Gear Backlash Ring Gear Bolt Torque Carrier Bearing Cap Bolts
GM 7.2" IFS 11 to 14 in-lbs. 6 to 7 in-lbs. .006" to .010" 65 ft-lbs. 60 ft-lbs.
GM 8.5" / 8.6" 14 to 19 in-lbs. 6 to 8 in-lbs. .006" to .010" 65 ft-lbs. 60 ft-lbs.