56 stepside - "half a turn" of play is likely to be other worn components, not the steering box - have some one work the wheel play while you look underneath and see if you don't have bad joints somewhere like the drag link or tie rod ends
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics
