It all depends on the year of the tractor. There were a lot of variations of the JD A and B over the years. When IH changed the H and M they became the Super H and M.
In 1939 the gas Farmall H had 26.2 belt hp and the distillate H was 23.3 on the belt.
A JD B in 1938 was 18.53 on the belt and in 1940 went up to 20.52 hp. When the late styled B came out in 1947 the gas version was rated at 27.58 belt hp.
Similarly a 1939 Farmall M put out 36.6 on the belt.
A 1939 JD A put out 29.59 on the belt. That went up to 38.02 when the late styled A came out in 1947.
A 1937 JD G was rated at 35.91 on the belt. In 1947 they were rated again, this time at 38.10 (G's were always run on distillate)
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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