Winch Services

Good afternoon I have a 1982 Autocar DM in great condition w only 130,000 miles on it, was a town truck. Has power steering and steering is very light. Seems to be some play in steering box, I think this is called lash. Can this be adjusted / tightened up ? On front of box is an adjustment stud with a lock nut. I ran the stud in and play was worse, I ran it back out as far as I could before the stud hits a bracket. If I am correct so far, how far can the stud be backed out ? Thankyou