A guy on that ford forum found a bracket and shock setup for ambulances that holds the wheels in place until the steering wheel makes it move. Look for a post called "a real solution to the steering issue" or something close. A workaround but it helps. I used to drive an early 70's econoline as an autoparts delivery truck. I swear you could move the steering wheel 60* or more before it would move the wheel. It made it real exciting in snow trying to steer.