What Roy said. However, to directly answer your question, the nut you're
looking for is the over-travel adjustment nut, which is directly opposite
the pitman arm (on the other side of the steering box). There should be 4
bolts holding the cover to the box, and the adjustment nut is in the middle
of those four. You loosen the locknut with a wrench, then turn the adjuster
with an allen key. This isn't really meant as a slop adjuster, so if you
have to more than a 1/4 turn or so, you're looking at a new/rebuilt steering
But again, before looking for slop in the box, check the steering shaft (I
believe a truck that old will have a rag joint at the end of the
intermediate shaft - check that for wear, too). A buddy with a big set of
channel lock pliers is the best diagnostic tool. Grab the intermediate
shaft and hold tight - then see if you still have slop in the steering
wheel. If so, it's the U-joint of the intermediate shaft. If not, the
problem is further down the line. Grab the outer half of the rag joint, and
wiggle the wheel. If it's sloppy then, the rag joint is loose. Then, grab
the pitman arm. If slop is detected then, it's in the steering box.
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