Why is everyone so gun shy about adjusting the steering box? That adjuster was put there for a reason - to compensate for wear over time! The Saginaw type boxes are one of the easiest to adjust. I've done it the way an old-timer mechanic showed me over thirty years ago with no problems whatsoever. Its worked on Jeeps, Land Cruisers, Land Rovers and Chevy pickups.
While holding the screw with an allen wrench, back off the lock nut. Turn the screw clockwise until it JUST TOUCHES. Back the screw off 1/8 to 1/4 turn, then tighten the lock nut. This will return it to factory tolerances. It made a world of difference on my TJ.