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Hey Folks!

Still working on my old JD 4320 transmission project and I'm getting to a point where I need to start thinking about buying fluid and filters. I ran across the article below and found it pretty interesting! In a nutshell, "real" JD 303 oil was discontinued in 1974 because it had whale oil in it. There is no actual JD303 specification set after whale oil use was discontinued. today's JD303 oils are all over the board as far as specs go. JD Hy-Guard it is, I suppose! $$$$$$$$$$

 

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I think you are right for L&G tractors. However, farm and industrial moved to Hy-Gard without any fanfare that I recall. A five gallon pail, part number AR69444, sold for less than $20.00.
 
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