Mopar 8 3/4 Clutch Type Sure Grip Case 742

Hey guys, I'm in the process of determining shim stack on the pinion gear in the dif. I believe I have read that the torque of the pinion nut is 240 ft lbs. In order to reach that torque, is the only way to install the dif back on the vehicle? Is there any way it can be done off the vehicle? Thanks everyone.