Confused - transfer case???? Alright, looking for some advice here. I was driving down my street at like 20 mph and I heard a clunk and the truck won't go forward anymore. I tried shifting my transmission(TH350), it will go backward but not forward. When I give it gas it feels like it wants to go forward but it sounds like marbles underneath me. Tried shifting the transfer case(NP203 - PO converted) and I had to jam it in 4lo and it kinda went forward then popped out of gear. I had to drive it back home in 4lo, in reverse, with one foot on the transfer case shifter holding it in 4lo. My u-joints seem okay. Any ideas on where to start?