I think the FSM calls for 90 ft.lbs. That is usually what I use. Short of stripping the threads on the output shaft, you probably can't have it too tight, within reason. I know when I first removed mine (to redrill the flange) after having it built by Marlin, I needed a 4' pipe over a breaker bar on the nut and a similar bar bolted to the flange to keep it from turning to just barely get it loose. This was after two different 1/2" impacts failed to get it loose. I say I just barely got it off because the pipe on the breaker bar was bending under the torque to the point it was bent from the frame to the ground before the nut finally gave way. I'm thinking Marlin may have used his special impact gun when he put that t-case together <img src="/forums/images/graemlins/smile.gif" alt="" />