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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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