I replaced my steering box, and that made all the difference in the world. I got a new box @ O-Reilly for less than $200. My truck has the best steering feel it has ever had. There is no slack(slop) what so ever. I have had this truck for 10 years. My truck has always had a little slop in the steering box until now. Just be sure that if you replace the box that you get a new box and not a rebuilt one. I think it is only 10 or 20 dollars more for new.
I also replaced the steering box and NAPA was not so kind to me. So far it seemed to help. Tomorrow off to get an aliment and wheels balanced. Wish me luck! OH and thanks for the ideas