Thanks, I left out.......since the OP asked about the steering box.........watch the column shaft move along with the pitman arm. You can usually look down from the top and see them both, use a light. "Lost movement" AKA the column shaft moves but the pitman delays movement........you have found the loss within the steering box itself.
Refer to the factory shop manual !!!! ADJUSTING the box IS NOT JUST turning the screw adjustment. Read the manual for procedure. Play can also be, EG......slop in the lower pitman bushing not just play in the sector gear teeth.
