Ive got some serious vibrations coming from mid to rear of my kj. When I inspected the driveshaft to check for faulty ujoints I could NOT get any play in either joint but at speeds of 30+ i feel some serious vibrations and and occasionally a clunking. Also if i come to almost a complete stop but have to then apply gas before coming to a complete stop it feels like something comes unattached underneath and then reconnects or like a yoyo/train. Any ideas?