741 pinion nut torque too tight- did i damage it

try this --- back the nut off and hand torque to 50 lbs/ft , then turn the yoke several revolutions back and forth ---now tighten the nut to 100 lbs/ft and again turn the yoke ,, then to 150 lbs ft turn the yoke again then tighten to final torque --- if it doesn't turn at 50 lbs/ft or 100 lbs/ft -- stop there --- you will probably have to reset the pinion bearing preload shim pack thickness if you have a 741 or 742 case -- if it is a 489 case a new crush collar will have to be installed or if you can get the front bearing out drop a .010 shim on top of the crush collar ,, reinstall the bearing ,,, seal ,,, and yoke ,,, retorque to the proper pinion bearing preload --- 20-25 in/lbs new bearings -- 8-15 in/lbs used bearings