Hi All posting for a friend he has a 2002 f 250 7.3 4x4 reg cab that now wanders all over the road you always have to be moving the wheel to keep the truck on the road he has replaced ball joints tie rods steering shock even the steering box still no help anyone here have this prob if so how did you fix it

 

sounds like its a problem with the power steering part of the system. I cant remember what its called, but i think there is a valve that keeps the pressure at normal pressure when you are driving straight down the road...