im fairly sure its my transfer case or cv joints. i put it in 4x4 high (still does it in low also) and it will make a diecent clunk when it locks in. after that if you put it under any kind of stress it clicks/grinds and pops and makes a ton of racket. T/C has pump rub fix also. maybe a loose chain or something in there? im not real sure what is going on but this will only make this noise in 4x4. also my trans has a triple disk convertor and a stage 4 suncoast in it so i do not believe it is anything trans related. Any ideas?