IIRC, the tech material gave very specific reasons for NOT using 90wt gear oil. Was a matter of shear, and a matter of oxidization. 50w motor oil can run at higher temps without oxidizing. Back when these old tranny's were built, the horsepower wasn't crazy stupid, and a lot of trucks didn't have transmission oil coolers, they weren't needed. So, they ran pretty hot.
Speaking of horsepower. When did it become mandatory that a truck had to have 5 bazillion horses? We got by with GEARS.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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