When I try and turn or load up the 4 wheel drive the front in makes a huge jolt. it works in 4 wheel drive but does this after it loads up. Both Cv axl's have been done already as well. I am guessing it has something to do with the transfer case. I also can't manually shift it into 4H while moving even slow with out it grinding. Any ideas on where to begin and what I need to get replaced?

 

try to wiggle the driveshaft on my truck (same as yours) the bearings on the outputshaft where shot.

 

we have done that and that is not it. Its not what is making the oil go black in the transfer case.

 

The extra oil in the transfer case is caused by the frt seal in the transfer case being hard and cracked must use autotrax blue oil only. If oil in case over full replace seal. The extra oil in the case will cause all kinds of probs