transfercase problem

[sgilbert]

I have a 1996 h1 and I was four wheeling the other day now I think I have a transfercase problem. Its hard to shift into 4*4 and back but it will drive but it makes loud intermittent loud bangs under the center of the vehicle when I pick up speed. It sounds like something is going to bust at any time. Could this be the transfer case or a differencial problem? Thanks!