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NAA: Diff = 9 quarts Hyd = 8 quarts Trans = 5 quarts 800: Diff = 11 quarts Hyd = 8 quarts Trans (4 spd) = 6 quarts Trans (5 spd) = 8.5 quarts Trans (SOS) = 11.5 quarts New Holland currently recommends the new 134 gear/hydraulic oil in everything (except maybe the SOS....don't know much about that trans). There are separate compartments on both tractors...3 drain plugs, 3 fill plugs. Trans fill is on top of the trans. Hydraulic fill is below the seat. Diff fill is on top of the diff. Some here (including me) prefer to use the thinner 134 in the hydraulics only and some sort of gear lube (80W-90 for example) in the trans and diff. Check the archives on the subject, read the arguments for both positions and make your own choice. Notice the fill capacity for the 800 will depend on which transmission you have. The SOS didn't really come on an 800, but so many people refer to an 801 as an 800 that I included that to cover all bases. The numbers came out of my Ford authorized reprint shop manual.
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