i got really noisey 4wd. its kinda had to describe but it only does it between 15 nd 30 while in 4wd. X-fer case has full fluid, Front Differential needs a lil TLC, new axle shafts on the left side. though when i was installing the new shaft there was a material in the ttb that looked like plastic but it wasnt, wasnt metal either. I was thinking it was something a lil outa whack but can anyone give advice on the possibilites.