Well first off you need to source the parts. This is one of those things you CAN'T get from the CaseIH dealer. It's got to come out of a salvage tractor, and then you need to know what you're looking for to make sure you don't just get another "regular" 4th gear set for an M.
4th gear on a Super M is the "fast" gear from the factory, so you may have better luck looking for a Super M, than a plain M with the somewhat rare 7MPH 4th gear option.
Then you need to split your M at the bell housing, remove the torque tube section, and completely disassemble the transmission. Swap out the gears, and it might be a good idea to replace some/all of the bearings while you're in there. Definitely new seals and gaskets. There's certainly some setup to do with shims to ensure proper gear mesh.
It's a job. That's why there aren't many Ms with the fast 4th gear out there.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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