so last nite was a bad nite for the truck. it went through a lot of stuff. now when i do about 45 or so i hear some type of grinding noise. could this be my u joint? it sounds like its coming from the t-case area. my driveshaft hasn't been legnthed yet. could that cause it? also where is the best spot to get one for the rear. and btw it happens when i am in two wheel drive. also when i put it in four.