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75-90 GL-1 from NAPA, WalMart, Tractor Supply, etc., is about as close to original as you're going to find. Oh, yeah, and TSC often carries a gear oil labelled "for use in older Ford tractors". Modern GL-5 gear oil is reputed to contain chemicals that can harm brass parts in the 'N hydraulic pump, so it is best to stay away from that. Somewhere, in later years, Ford New Holland put out a spec. to it's dealers to sell "134" oil for the 'N rear ends. This is, more or less, a version of "universal tractor hydraulic and transmission fluid". You can find oil by others than Ford New Holland (now CNH), that will say on the label "Meets Ford 134 blah,blah,blah specs". This oil is a lot thinner than the 90 weight mineral gear oil that was spec'd when the tractors were new. Advantages of the new, thinner oil... less "drag" in the gearing, and better hydraulic performance in bitter cold weather. Disadvantages of the new, thinner oil... leaks "easier" from the 101 seals and other places this old machinery likes to leak. Hydraulic three-point hitch will leak down faster. Hydraulic pump may be noisier with this oil. So, it's really up to you which oil you use. The old oil is just fine. Working 'N's have used this oil for 50 + years, and are still going. and the new oil isn't goin to hurt any thing, either. Rated oil capacity is 5 gallons. Because of sludge and crud that doen't drain out, 4-1/2 gallons is more likely. Some 'N oldtimers suggest removing the lower bolt on the sidecover on the RH side of the rear casting. (The PTO shift lever comes out this cover). You add oil until it begins to drip out his lower bolt hole, and then stop. Check the oil level with the tranny dispstick, and it should show near full. Note this oil level on the dipstick for future reference. Replace the previously removed bolt. Filling above this level makes leaks into the brakes and the clutch housing more likely.
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