when i was driving down the road today, i was feeling a vibration like the u joint was wearing out and breaking. when i got home and i put the truck in park and then reverse there was a large clank that seemed like it was coming from the transfer case area. i have a 208 t case....could the vibration be cause by something gone wrong in the transfer case or the cv joint on the front of the transfer case? i replaced the rear u joints last fall and have driven about 5000 miles since then, so i dont think it could be those again, but im not sure. can anyone help? thanks.