Terry: R11 and R21 will be no different in size, R21 is just a later casting production run. The case hardening process changed in 1953 during Super A production. Gears after that time should be more durable.
I've never checked out gear ratios, however I do know my SA achives the same speed in feet per minute turning 1540 RPM with 9.5x24 tires as my 130 does at 1650 RPM with 12.4x24 tires. My 140 is a bit faster with 12.4x24 tires, and I expect this is due to engine RPM and 130 and 140 are indeed the same ratio. I know this as I have them all calibrated for spraying, thus we calculated it in feet per minute. This feet per minute was done in both 1st and 2nd gear, we had no reason to check 3rd and 4th.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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