I have a loose steering problem with my 99 f350. Its loose while driving down the road and even when the truck is parked and shut off. I turned the steering wheel back and forth in the dead spot and looked under the dash (while truck is off) to find that the shaft moves perfectly with the steering wheel and the upper u joint on the shaft has no play. I had someone turn the wheel back and forth in the dead spot and checked the pinion arm and it doesn't move so the play is farther up in the steering box or the lower shaft. Any ideas?