yeah man wheel bearings fo sho. i had it soo bad. i went to do a tire rotation and when i tried to spin my tire the dang thing didnt even wanna spin....it all started when i put 33's on....189grand on the truck at that point. after driving around with 33's on about 9000 or so miles i started hearing a squeek and then it escalated to a shriek and then a scream.. they were so bad that the clip that was holding the brake pad in was rubbing up against the the disc brake....yeahhhh..... took the dust cap off and all the little bearings just fell out in individual little pieces...forreal man for your saftey and and for the truck i would check the bearings before all....its not hard to do at all.. but good luck bro and hope you find the problem and is an easy fix!
Estate Green '01 Sport Trac 2wd 4.0: warrior shackles,15x8 pro comp 152's wrapped in 33x12.5 Mastercraft Courser M/T's, Xentek 5000k HiD's, 20% tint, King 2.0 x 6.0 Coilovers, Fox 2.0 x 10 with resi's, shock hoops, boxed and johnny jointed a arms, and foa bumps, coming soon: spindles, and uniball uca's.