Over a period of many years, 1952-63, I did many modifications to my '36, I always did my best to avoid having to use a Victor Wrench/Arch welder to make things fit, therefore I used many Ford parts from '36 to '48. I guess my car could be called 'A Johnny Cash Car'.
The modified 59AB engine in my car made it go fast, however the steering and brakes left a lot to be desired.
The '40 steering gears really improved the driveability of the car, it was like adding power steering compared to the '36 worm and sector assembly. I installed '41 spindles when I converted the brakes to hydraulic, then a few years later I switched the front axle to a 2" dropped axle from a friend of mines '41, utilizing aftermarket tube shocks and a later model covered spring.
The pitman arm that I originally used with the '40 steering gears always bothered me, the way it hung down below the tie rod. I tried several combinations of pitman's, I was relucktant to modify the pitman.
In about 1963 I converted the brakes on my brothers '36 Ford pickup to hydraulic, I parted out a '47-48 Ford station wagon that was sitting in a local wrecking yard to get the brake parts for my brothers truck.
I don't clearly recall how the '42-48 21A pitman got onto my car, I can only assume that I had it from the wagon and decided to try it on my '36, to my pleasure the 21A part solved a problem that had bothered me for years.