On my 84' it has a 4" lift, when I shift to 4 LO it seems drive normal,but when I shift to 4 HI it doesn't want to go much and the whole truck shakes, so I give up trying and I put it back to 2 HI and free the hubs, when I drive it feels like transfer case is still attached, then I back up about 20 ft. to try to free the attachment, BUT it makes a crunch noise and the truck won't go any more and some grinding noise when I give some gas. Oh my God! I break something. Would somebody have experience knowing what I break and where I can get parts for the transfer case? thanks!