Gear size is the same for a M and SM but the shaft was changed on M tractors near the end of 1951 production and the same shaft was used on SM tractors. Late shaft is just a little different length and a bigger bearing was used on the front of shaft. Input shaft bearing housing, bearing retainer, and the front yoke or coupling were some things changed at the same time. As already said 400 and 450 are different.
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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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