The little I know and I could be wrong but was taught to take the wheels off the ground and have someone turn the steering wheel back and forth a little and tighten the box up until you feel some drag on the steering wheel and back the adjuster off a 1/4 turn.
When i did the manual box in the Fargo, i had buddy gently rock steering back and forth until there was very little play. Could actually feel it in the screw, as it went slack. Worked very well. 65 mph with one hand on the wheel.