Is the pitman arm keyed to the steering box output shaft? Could you lock the steering wheel straight and find the new center on the pitman arm to take up the difference?
The 4wd steering box has splines on only about .25 of the circumference of the sector shaft, thus allowing the pitman arm to only go on one way. Attached photo is the inside of a pitman arm, so you can see the splines.It is key'd, has a wide grove every 90* so it can only go on 4 different ways.