Only difference in the last M tractors when built and the first SM tractors when built was a 1/8 inch bigger bore in a SM, different gear speeds in 2 to 4 and reverse gears. Also the emblem and emblem mounting holes on the grill and some tractor decals. If you go earlier on a M or later on a SM more changes are found.
Forgot to mention choke levers on different sides of the carburetors and some casting numbers.
This post was edited by D Slater at 03:01:04 08/29/13.
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