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Farmall M 4th gear speed.

You could also install a 9 speed transmission package into your transmission. I just happen to have one on the shelf for sale. My e-mail is open. charlie
 
M's had as a option, a 7 MPH 4th gear and you could also get a low low gear, which was a good option with a mounted 2 row corn picker. I had a M with both options, I still regret selling it.
 
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.
 
Thanks for the reply. I have to go into my transmission this fall anyway for bearings. 5th gear has got a bearing whine and I want to repaint so I'll be pulling it apart anyway. Now to find a Super parts tractor.
 
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