IH and some aftermarket had some faster 4th gears, but hard to find now. Some of the 6 series had a 4th with gears one tooth bigger driving a one tooth smaller 4th and 5th slider compared to the M. Problem is the transmission has 3 gear sets that are one piece with a different size gear on each end. So sometimes when changing one top and bottom set of gears it gets more involved. Since all SM gears except first is a different ratio and the counter shaft is a different diameter where the gears go. When installing in a M you need all the SM gears, counter shaft and the reverse idler gear. Aftermarket 9 speed may be a option, but they also speed up the pto. So if needing the pto and running the tractor at a higher speed you need to be pulling a light enough load to run at less engine RPM. Also some gear boxes are around that go where the belt pulley gear box is to give another speed between 4th and 5th. Not very common. If you never need a slow first a W6 ring and pinion gear can be used to speed all gears up.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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1965 International Harvester McCormick Farmall cub tractor 2,500. Two owner tractor. My grandfather bought new in 1966, then we inherited it. Have all the paperwork original manual and all maintenance records. It starts and moves. Comes with underbelly mower, plough, and some other attachments.
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