ok i swapped the tires and the noise is gone in 4x4 auto. however its still there in 4x4 high. noise seems louder at lower speed, bearings seemed fine and the sound doesnt change when turning or leaning into one side or another (kind of rules out bearings). can it be a front u-joint? if so how hard is it to change? i didnt check the fluid level in the transfer case yet. i took a quick look at the front end, no rips in cv joint boots or any signs of leaking. also this seemed to start after i changed that tire to the spare. i bought the truck in the spring though and havent really used 4 wheel drive until this week other than making sure it engages back when i test drove it. i did order the other 2 new tires (general grabbers) and they will be installed on thursday. could the bald tire i put back on be so much smaller than the other "decent" tire that it would do this? i guess ill know that answer thursday when all tires match