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#6
06-22-2018, 04:43 PM
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You could put a mark on the input and output shafts, put it in first gear, and if the output shaft turns 2 and a half times with one turn of the input shaft, that would be a M-20 (2.52:1 ratio). An M-21 would turn a little less then that, at 2.20:1.
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