[mr48chev]

I'm going to say that you need to lay under it with a light while a helper gently rocks the steering wheel back and forth and you starting at the pitman arm and working to the right side spindle one step at a time observe each and every connection and rod end and see if and where any slack is.

The steering box is fairly easy but they have to tell you how far the wheel moves before you feel the pitman arm move. Then when the pitman arm moves is there any slack in the rod end on the drag link? then move to the rod end on the steering arm, then on to the left tie rod end and to the right tie rod end. After that you may want to jack the front end up a bit and check for slack in the king pins and wheel bearings.

A little slop here and a little slop there can add up to a lot of wheel movement. That doesn't mean don't check the adjustment on the box and you may want to do that first but don't crank down on that screw just gently bottom it out and tighten the jamb nut. Or tighten it up a bit, back it off and just bottom it out. That is a gentle Just.