one thing to look for under the front is a bent tie rod, common on these trucks from a number of things, including jacking the truck up with it .... clean everything well, like a power washer on all the joints to remove the caked on junk - have someone work the wheel back and forth 'forcefully' without causing the wheels to turn, while you look at what moves and what doesn't, see if every joint is as tight as you think
Bill
