They are essentially the same. Differences in some components such as better gears on the camshaft and a bolt pattern on the front cover compatible with live hydraulics on all later tractors including the 450. Slightly stronger Belly pump. Differing seat systems, differing (many) types of starter switches, and some bearing upgrades that are (IIRC) backward compatible. The 42 is a war year tractor, not as many produced, the 51 is just another M. If they had the same hours, and similar tires I think I would still go with the 51 for conversion to live Hydraulics. Jim
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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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