My truck has the same popping ,clunking,especially when turning the wheel with truck going real slow,it sounds and feels like it's coming from the steering colum not the intermediate shaft,but when I try to wiggle the steering wheel I have no play. The dealer has replace the steering box and the intermediate shaft which seemed to help for a little while but now it's back. I could swear it's coming from the lower steering colum where its goes threw the firewall.