I continue to have a problem with the truck weaving a bit on the highway. It tries to follow any slight depression in the road. I've replaced: Drag link, Left inner tie rod end, Both outer tie rod ends, Ball joints, Wheel bearings, and this past weekend Radius arm bushings. It's actually gotten worse after the radius arm bushings were replaced. The old ones were really fried, split in two with pieces missing. Someone told me that you can loosen the nut on top of the steering box and turn the screw one way or the other and tighten the gear lash in the box. The shop manual just describes a method to center the gear with that screw. Does anyone know if the box can be tightened up with that screw?