I guess I should have asked 2 separate questions. One on how to slow down an M and the other on repairing a Farmall H.
First of I should say that I don't want to kill another tractor to upgrade an early M.
I guess really that you are right, the best option would probably be to find a newer tractor and put the gears from another tractor or from an early M in the newer tractor. I really don't want to take apart a good running M for its gears, although I guess that I could put the gears from an SMTA into it.
The other point you made is it depends on how hard your soil is. In Arizona I think that it is like tilling rock and I would like to run a 6 foot wide counter-rotating tine tiller. From what I was told, I need at least 35 PTO horse power to run the tiller and that I won't have it with an M. If I went with the heavy duty model (which I really think I should) I would need 50 to 55 PTO horse power minimum from what they told me. I really don't know if this is true or not. Honestly, I have seen Ms and MDs run equipment that every one said there is no way it could do. I guess really looking for a 450 or 560 diesel would be more practical, but I would really rather have an SMTA with early M gears.
I really should have started this as a separate thread, but I know where there is an H that the original rear case/transmission housing has a big hole in it. If I can I am going to do my best to fix this tractor. Let's say for the sake of argument that I had a 300 transmission housing. How hard would it be to put it in the old H? Would I be able to use the axle housings, the axles and final drive from the old H or anything else? I guess that I could use the gears if they were any good.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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