Hi I need some inforemation. I have a 67 which is stock but for 33s. It's a 170/3 on the tree/no power steering. Running some trails in the woods no rocks/no mud doing fine till about an hour in the steering wheel would turn 1/2 before the wheels would turn. It has the original rag joint (which dosen't seem to slip). the gear box dosen't leak but dose move about 1/4 turn before the pitmen arm moves. I left it cool off and it was fine. Went and ran a gravel pit same thing after a hour. I can run it on the road for 3 hours with no problems. Everything on the frontend is tight, tierods, kingpins, draglink, wheelbearings, U-joints, C bushings, new springs, new shocks, new tires. I'm lost anything in the steering collum that could be causing this? The Bronco has 75000 miles on it. Any thoughts Thanks