I have a 1992 ford f350 with the 7.3 diesel in it. I was driving it and then the steering became hard to the right. Now I have power steering to the left but none to the right. I jacked the truck up and checked the steering components and none seem to be sticking or hanging up, and the wheel turns left and right freely while jacked up. But once the weight of the truck is on the tires forget it.