I don’t think you can do much for excessive steering wheel movement to the steering box. By adding or removing shims you can stiffen or loosen the steering but that doesn’t affect side to side play. I would expect you’d need to either replace the peg assembly that runs in the worm or the worm itself. If fixing/replacing the crosstube now that you’ve done the tierods and such doesn’t fix it the easiest bet may indeed be a better condition box.
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