Steering gear box play

[Beaumont@]

Is it normal to have a little play in these truck gear boxes? I replaced mine over a year ago with a reman Napa box and it has some play. I assumed that as soon as the input shaft turns that the pitman arm shaft should turn as well with no play? Mine is a mid 80's 7802644L steering gearbox. Whats the deal do the worm gear or sector shaft/rack gear wear over time? Any info would pretty appreciated. I want my steering to be as tight as possible