RE: Axle Nut Size and Torq Spec.
The Axle Nut Size is 1 11/16"
The torque spec on it is 175 ft. lbs. I didn't have a torque wrench that went that high when I changed mine (I do now though), so I just ran it on with an impact and used a breaker bar with a piece of pipe on it to tighten it down. I probably over torqued it, but it hasn't seemed to hurt anything yet. That was 8,000 or so miles ago.