Originally Posted by 4x4_Welder

Never, never adjust the gearbox until you make absolutely sure all the rest of the system is up to par. That should never need adjustment unless it was defective in the first place, and tightening it can cause major problems like a locked up steering system, bearing failure, failure to return to center, and very stiff steering.
Mine had a bad center link when I got it, combined with bad strut rod bushings. It would wander all over the place even after I replaced the center link. I suggest you get under the car and start moving steering and suspension components around to see what's loose.