It looks like you are referring to the ball nut?
Part 16 in this diagram (part 19 in the diagram you posted)?

Did you have to go through the procedure Assembly of the Steering Gear ? Did you do this on the bench or on the truck?

I have only done this once (about 8 years ago) and I do not look forward to doing this again.

I have never shortened a steering column, so I have no idea what is entailed in that operation. Maybe someone with more experience will post better questions and some advice.