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The usual oil for Ford trannies back then was straight weight 140, GL-1. That's hard to come by, StaLube makes it and NAPA's can order it (p/n SL 24228 (qt) SL 24238 (gal) )but it's pricey. You can also buy off Amazon.
Lots and lots of debate on many forums over whether commonly available GL-5 gear oils are OK for use with brass synchros. I just had to refill my trans so I did a lot of web searching. I believe the story is, most GL-5 used to contain "active sulphates" that would eat brass when hot. GL-4 didn't allow use of active sulphates, so it was safe. But in modern times, almost all the Brand Name oil co.'s have switched to inactive sulphates for their GL-5, and many say right on the bottle they are safe for copper.
I ended up going with SuperTech 85w140 from WallyWorld, which has the statement about being safe for copper in manual trannies. I am pretty sure that's what I was running in my trans for the last 8 years, and when I had it apart, the brass looked good (active sulphates stain the brass to a blackish color).
The Novak guide is primarily for the units Jeep used... Even Ford changed to 80W 90 later on in the 50's . But in the early units 140W summer is what is and was called for. As I recall there was another individual with an 48 or 49 1.5 ton having the same issues and filling 140W resolved them. I think these early units had more clearance just due to manufacturing tolerances. I believe if you replace the synchros and rebuild to current specs with modern synchros then 80W/90 is the way to go.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.
