I talked to John at Northwest Transmission (nice guy) and he said the rear retainer (cover, tail housing) is the same for the 1/2 ton and 3/4 ton trucks. The front yoke (as previously mention is specific for the 1/2 tons with a 4 speed and is difficult to find. The rear yoke is the same for cars and trucks. The Filling Station listed a SM420 universal joint assembly (NOS) but it's very pricy ($400 - which Jerry alluded to) but it's not available currently. I'll post in Parts Wanted and hope for the best. Maybe. just maybe, I may find what I need.

It's a small world, but I wouldn't want to paint it.