Ron.. yes I like to keep those informed that maybe in the same boat!
As you probably have followed along, so far did the Bilstein HD shocks all around and that helped on the swaying and the bumps. Before that did the Blue Ox frame stabilizer on the rear. Am not sure of its effectiveness yet.
For the steering "return to normal" problem, I suppose I could install one of those pricey Paul Harvey steering stabilizers, which would mask the problem. (Poor little power steering pump must really get a workout with one of those am thinking. My steering wheel turns hard enuf without more springs. ) So I will watch if it loosens up on its own, or I will just return it to Ford. The steering box replacement certainly made the steering more predictable. The mechanic admitted he wasn't that experienced with the 350 SD when it comes to steering. Guess they may not get that many in there car garage. He has been a friend of mine for many years, and been in the business all his life at Ford. My brother has more experience maybe with the big trucks as when he worked for Ford that is all he worked on. So will let him test drive it when I get a chance.