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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