Originally Posted by Ferris Bueller
I just rebuilt mine and am going to put some fancy AMSOIL 80/140 or something to that effect in it.

Really bad choice- - - - -the super slippery synthetic lube will prevent the synchronizer rings from gripping the gears, and you'll end up with a lot of gear grinding, particularly on a downshift. Those heavy gears have enough inertia that synthetics don't work well in them. The straight 90 weight mineral oil (not hypoid) that's specified for Ford N-series tractors is exactly what stovebolt 3 and 4 speeed transmisisons need. Our local source in the southeast USA is Tractor Supply Company, but I'm not sure if that business operates in other parts of the country.
Jerry

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