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I know this subject has been beat to death but I keep finding conflicting information. Should I use 80-90 gear oil or straight 40 weight motor oil in my 1952 M37's transmission? Thanks

Hey everyone, I recently decided to get a M37. :mrgreen: I was looking for some type of project to work on when I came across this truck. It is in great condition and doesn't need much work. Just need to fix a few dents, some minor rust, and get a coat of military green paint on her. I'm...