start by checking the ball joints, to do this jack the truck up and get on your knees or your butt and put your hands on the top and bottom of tire and try to move it, if it moves then it probibly the ball joints if not it could be the springs wearing out or sagging which could cause the tires to tip in.
Oh actually when i did my guages (2 weeks ago) he did test my front end bearings by gerking the tire when its up in the air. there was no movement so i guess the bearings are good. any other ideas? its a 97 OBS 4x4
yeah the 250's had twin I beam and for what ever reason fords with this have been notorious for this positive camber (i think its positive does the top of the tire tip out or in). Its just something they do and funny enough they don't wear tires and different. you can check the ball joints by jacking it up a little bit, stick a prybar under the tire between the tire and the ground and pry up on the tire. There should be very very little to zero play (movement of the tire before the suspension moves up). if there is movement then its time for ball joints.
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