As long as you use a good grade of gear oil,the classification doesn't matter much.Lets face it,these transmissions and differentials don't turn up all that fast,and considering the gunk I've drained out of most of my tractors when I get them,(including water,and lots of it),any fresh gear oil would be an improvement.
Gear oil considerations become important in truck transmissions,considering the speeds and loads,and changing temps and climates.
Also consider the changes in oils from when these tractors(letter series)were new.
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Today's Featured Article - The Mud Daubers and the Old John Deere - by Jon Zehnder. I have a 1941, John Deere Model A tractor I have owned for about a year and a half. This is my first (in case my wife reads this, "FIRST") tractor and it has been a learning experience. After considerable advise and assistance from local tractor nuts and the forums of Yesterday�s Tractors, I had finally got it running pretty well. I have tuned it up, overhauled the carburetor, installed a borrowed, rebuilt magneto, installed a new Power-Trol, patched the radiator, installed new front wheels a
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