Adrain: All gears are the same in size, number of teeth, etc. There is one other concern, and I don't have exact serial number, however mid way through SA production the case hardening of gears changed. From mid SA on those gears are harder, and I'm not sure it would be wise to mix harder gears with older ones.
My experience also tells me never change gears to run on other gears having a different degree of wear. For example if you change 2-3 slider, install the matching gears they've run on for years.
I don't know if new gears are available, might be worth checking out. I know I was surprised I was able to buy a new crank pulley.
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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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