Stuff I have replaced within past 2 years:
Inner/outer tie rods (mostly OE or ACDelco pro). Hubs (both sides). PS pump, belt, links and bushings. The upper control arms are good. New Moog lower control arms. Torsion bars are good.
As for the gearbox. I adjusted by jacking front end off ground and incrementally tightening hex until slack was taken up but not so much that it would bind all the way to the left or right. I then torqued nut while holding hex. I have no steering slack. everything is tight. I don't think steering is the issue here. I can jack up one side of the front and try moving the wheel in all directions but it is rock solid. This seems like more of a suspension issue. Starting to lean toward torsion bar section