WA WTB Muncie granny low 4 speed FM-420

[burnem]

thanks for your response I do appreciate it, that is how a person learns. what I do know is
that in the 67 3/4 ton 4x4 they used that trans and married it to a Rockwell transfer case I have one of those, the feed back Iam getting says the 4x4 trans is different that the 2wd. one of the biggest question I have is witch number is correct some people say its a SM420 and some say its a FM420 maybe I just heard it wrong FM420.