Your first post talks about power steering, and the second is talking about the 4 spd.
There is no bolt in true power steering. The steering of the day was the manual box you have,
with an optional hydraulic assist that was added on top of the stock manual steering. There are
multiple options for true power steering that can be modified in. Search in this forum.
The old NP435 is a very stout unit, are real monster by today's standards. Many times It isn't
totally synchronized, which makes many people think they need rebuilt when they don't.
71 D100 Adventurer SE - PowerWagon conversion
70 W200 CrewCab - Urban Assault Kiddie Hauler
69 Plymouth Fury III Convertible - Pro Touring Machine
69 Plymouth Fury III Convertible - Beater, Hiding in a cave