Yoke nut size

Input shaft I’m guessing based on the hints from that build sheet….
I mean not to be a smart a but your best bet is probably a caliper
I would guess it’s around 2.25
Axle nuts to get the hubs off are anybody’s guess depending on who’s been in it

 

Which yoke nut you're referring to would help. I'm not sure on one that old, but as @W923 mentioned, 2-1/4 and 2-3/16 are common on input and output yokes on the front drive. I was thinking rear axle I've seen down to about 1-7/8".

Carrier bearing yoke usually 1-1/2 or 1-5/8 IIRC, and trans are 2-3/4

 

1-1/4-18 thread size if it is a 1-5/8 socket size.