There is an allen head set screw with a lock nut on top of the steering box, you can take some of the slop out with that. The bottom end of the bolt inside the steering box looks like a V that rides in a groove and can get sloppy. Just be careful and dont get the set screw too tight, once you tighten the lock nut it may overtighten the set screw and be hard to steer. It's best to just turn the set screw very little, tighten the lock nut and test it, steering it lock to lock to make sure it didnt overtighten. Having a helper just wiggle the steering wheel while you look at the pitman arm will help determine if the steering box is reacting as fast as the wheel is being moved. Also you might want to check your rag joint and slip joint for slop before you go adjusting your steering box. And if all else fails maybe you need a front end alignment.