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Tucson, AZ

Out here there’s an older guy who owns 10’s upon 10’s of acres of Military vehicles, I’m talking hundreds of M35A2 etc and he’s also a mechanic etc and he str8 up says he uses 85w140 for Trans, Transfer and Axles and then Straight 40 for Oil snd his comments were cause it’s always hot out here.

I am in Arizona and aside from a cold month or so it’s generally 80’s and now for 2 months it’s in the 100’s. I am only using 85w140 cause it’s good at higher temps in the gears and I have to assume it gets hot in there. But at the end of the day, I really don’t know.

I know, right? I ended up using 85w140 for Trans, Transfer and Axles. Not sure if it was right but it’s been months and I see no issues, thus far.

Thank you both for the information.. I suppose there is a chance I did not hear the mechanic correctly and maybe he did mention 85/90 for Transmission. Ugh, I hope I am not ruining my transmission. Maybe I should drain it again and out 85/90 in it. Even by doing my own googling I see same...

From a local repairman who has “experience” with these vehicles he mentioned I should use 85/140 Travelers Gear Oil for Transmission, Transfer Case, Gear Box and Axles. I am in Arizona and I wonder if that’s too wide a range?

Hello! Alright so I have looked at several threads in regards to what fluid to use when changing my Transmission fluid and really all it did was confuse me more. Mainly because of the vast opinions of what I should use! I understand there are a lot of factors and also a lot of personal...