You can adjust it, somewhat.... the nut in the center of the plate, on the
top of the box (opposite from the pitman arm) can be tightened to take up
some of the slop. Loosen the locknut, then tighten the adjuster with an
allen wrench. Don't go more than 1/8 of a turn. If you have that much
slop, it's time for a replacement. Re-tighten the lock nut when done.
Also, consider a steering gear brace, seen here:
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