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 - Trenching With a Plow - by Staff. Introduction: This interesting information came from one of the discussion forums here at YT. We thought we should place it up front so it could be read by anyone interested in putting old iron to work. [Editor] I tried something new today, and it worked so well I thought I should post it - in case it might help someone else. I'm running 100 yards of 4" drain pipe from the gutter downspouts of our house to a pond down the hill. This should hel
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