Once all other joints and knuckles have been done and as long as you don't have grinding noises or notches when turning, take off the large pitman arm nut, pull off the pitman after marking its location, take the side cover off, allow grease and oil to fall out over everything, pull out the sector shaft towards the engine, stick your finger in and grab the washer and shims likely stacked and stuck against the brass bush.
Clean and count the washer and shims and note their orientation. Take only the thicker washer, place over the cleaned sector shaft and guide the sector back in, reinstall the side cover, adjust the set screw so you have a little side/end play only, lightly place the pitman arm over the splines with the nut and spring washer finger tight and start to feel how much play you have in the steering. It should be down to 1/1.5in if you are lucky. If less than and inch, add shims until you have an inch of play. Unless the brass bush or sector shaft are heavily worn, you will have much tighter steering. Remember to fill with grease and on the older boxes, the small front side shaft seal works perfectly fine.
Follow the factory manual after pulling the entire steering box and shaft if the roller bearings or main shaft bearings are toast.