thanks, I was reading that Novak page earlier, they mentioned the following that had me wondering:
The SM420 most commonly has a large, 10-spline output mainshaft for both 2wd and 4wd versions. Some fairly rare 2wd models (likely the 2-ton versions) featured a 35-spline and a male threaded output. These versions also have a rare, 22-spline first gear journal, instead of the usual 11-spline "skip-tooth" journal.
that is why I was wondering about bolting on the yoke and brake drum.