Thanks everyone,
4Crawler, I did check out your link (although after I sent my post), very impressive you did alot of analysis. It answered alot of my questions.
It gave me a bunch to think about. Anyway the trucks on non-op so there's no hurry.

Oop's stated that I might need a D-Shaft disconnect to tow. Both of the manuels for my 93 and 85 state that they should be towed in 2wd hi with the trans in in netural. It does'nt give a limit of 50 mi or anything.

Does anyone know if drive train damage can occur if I don't disconnect the rear?