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if your frame and all your steering components check out fine (tie rod ends, drag link, ball joints, etc), then it sounds like the gearbox. did you ever check the steering stops i mentioned before? the little bolts that are on the spindle assembly, towards the bottom? you'll see 'em if you look in between where the spindle assembly connects to the axle tube assembly...that's what limits your max steering radius...make sure that's not stopping you...
Was the correct steering arm installed when your truck was lifted? If not your turning radius will suck.I wouldn't replace the steering box unless you verify it's toasted. Rock the steering wheel with the wheels pointed straight ahead. Observe the steering shaft rotating back and fourth vs the movement of the pitman arm. If there is too much play make a witness mark on the lash adjuster, jam nut, and gear box cover. You can loosen the 5/8 jam nut while holding the lash adjuster with an allen wrench. Then turn the lash adjuster in while your assistant rocks the steering wheel. Once the lash is taken up you will see more response from the pitman arm in relation to the steering shaft. DO NOT over tighten it. If you screw up you can go back to your witness marks and start over.If there is play in the pitman arm at the center link replace that b4 you mess w/ the gear box.