I just had the fluid changed about 10k ago and i just got it quickly looked at by my mechanic (hes to busy to do my truck till monday) and he told me from the sound of it that i blew the rearend. He said the noise isnt coming from my transfer case but monday will be the day i find out for sure. Guess its better then needing a new tranny?But im thinking about going with some 4:10's or something now.