It's a little heavier duty version of the Gemmer II steering gearbox. The procedure is in the 1949 through 1951 Lincoln Mercury Overhaul Manual but it's pretty much the same as the Ford cars up through 1948 and the bonus built pickups.
They are only tight in the straight ahead steering position. That's where they spend most of their life so that's where they wear first. One with only a little play can be adjusted out. One with a lot of play may or may not adjust back to no play. I've overhauled several Gemmer II boxes that were worn out.
Center links and idler arms wear out too, so check play at the pitman arm first then go out from there.