[Stocker]

Figure out where the slack is before replacing parts. Get someone to work the steering wheel back & forth (only as much as the slack play) while you look at the various steering components. Identify the bad part(s), then replace. You mentioned already adjusting the steering box, which indicates that *might* be the problem.

I don't know what's involved with converting to R&P. If you can figure it out, fine, but if your box is shot and the rest of the steering is fine, why not just replace the box with a new one?