In a 1/2 ton it'll be low enough to the ground on one is going to crawl under it at a show and nit pick....
Run whatever year you find.

Or, if you are set on finding the proper year transmission I then also hope you are as careful and exact on every and all the other details, making it as close to original as humanly possible.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-