For general discussion, the early Farmall M was close to the early JD G, both 3 plow around here. Towards the middle (post war) the G had its power raised where they were 4 plow around here. Variations occur when you talk about all fuel vs. gasoline for each, gasoline putting out more power. Early JD B was 2-12's at best and late B's were 2-14's very well. Farmall H was 2-14 straight through. JD A was 2-14 or 16 at beginning and 3-14 or 16 at end of production. Super M was 3-16 at least and usually pulled 4 bottoms.You also have to take into account soil density (sand vs, clay). Bottom line the JD tractor line went through revisions including power because production began 4 plus years prior to Farmall letter series. JD had to raise power and transmission speeds to compete. During the war, manufacturers had to divert resources to the war effort. Accordingly revisions to most product lines waited till the late 40's. Reading each manufacturer's history, it was always a gamble as far as establishing features and horsepower on a unit that would not be released 4-5 years into the future. The reality was often different than the expectations. Again, this is a general summary and I will leave it to others to cite specific changes to specific models in specific years. Back to spraying I will go!
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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