Just a comment. The Pitman arm and the steering box shaft have stamped marks which must be aligned. This ensures that the box is centralised when the steering is in the straight ahead position. Just one spline out can compromise the steering feel. Sounds like you have it right but when doing, say, a steering box lower seal change, and things could be a bit cleaner under there, the marks can be hard to see. Renewing that seal always a good idea when you have a box on the bench.