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 - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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