GL1 is the "old" gear lube for which the Farmall transmission was designed. GL2 is the same stuff with some anti-corrosion/anti-moisture additives. GL3, 4 and 5 are the same stuff but with EP (extreme pressure) additives. These lubes are intended for worm and spiral bevel gear sets which operate under sliding and extremely high tooth loadings.
It's alleged certain EP additives can be corrosive to "yellow" (brass) transmission parts (bushings, cone synchronizers, etc). Also they may cause increased tooth wear in relatively lightly loaded straight spur and bevel gearsets such as are inside old Farmall transmissions.
However GL3 and higher oils will probably work fine in an old Farmall. (Fresh GL5 will certainly be better than the 50 - 60 year old oil and water mixture usually found in these things!) However given the choice I'd opt for the GL1 (or GL2) lube that these transmissions were originally designed for.
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