|Originally posted by poncho_101:|
I can assure everyone that the axle nuts were not overtorqued.
You cannot be sure of that ... at least not unless you apply a torque wrench set to 200 ft-lb and observe some further tightening. You should never use an impact wrench to tighten a prevailing-torque locking nut. At the very least, if you don't use anti-seize on the threads you risk cold-welding the nut to the threaded shaft. I've seen it happen. (No, I wasn't the one with the impact wrench in my hand.)
Before going any further, my suggestion would be to back the axle nuts off at least a quarter turn and see if that frees up the hubs. If so, then tighten them back to spec (200 ft-lb) with a torque wrench and again check for smooth operation. If that works the hubs may still be permanently damaged, but there's probably nothing to do but buy new hubs and install them correctly or run these until they fail.
[This message has been edited by Marvin McInnis (edited 07-21-2013).]