get a helper. do not start the truck. open the hood, and look at the steering column above the rag joint where the column bolts to the steering box. have your helper turn the steering wheel from side to side. see if there is any play in the slip joint where the upper column meets the lower column. there is a spring steel clip, and a Teflon bushing in there keeping the two pieces tight. when the clip breaks, the Teflon bushing will either fall out, or travel up into the upper column until it falls off inside.

this will result in approximately 1/4 turn play in the steering wheel with the engine off, and when driving, it will take you the better part of 2 lanes to go straight.