What year is your FJ40? I did the mini-truck power steering conversion on my 71 and because the steering shaft was one piece into the steering box, I had to source a steering shaft from a later 40 which complicated things just a bit.
I went the mini-truck route because I could get it done without having to do any welding.
Everything works just fine, but at some point in the future, I'd like to do Saginaw as it is fewer components in the steering linkage, i.e. fewer things to wear out.
Ricardo Maestas - Bio Page
1999 LX 470, 1971 FJ-40