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 - 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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