The '93 rear axles is stronger than the '96 Runner, so you should retain it, the locking diff from the Runner will fit in the truck axles with a little modification to the housing.

The wiring issue is a lot easier to do today than it was when the article was written, ORS supplies them now.

More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed