741 pinion nut torque too tight- did i damage it

The rear chunk/ pumpkin is a 741 case and I took the yoke off of another 741 case. Both pumpkins are setup from the factory both had between 50-65 thousand miles on them. The pumpkin. I am having issues with has the right set of gears(3.23) in it. My spare pumpkin is highway gears. I am wondering if Cass was right that maybe it was a little loose and it washed the spacers then when I put 300# on it with the electric impact I took up that washed space.