M engine was 248 cid, Super M was 264 cid. However... most have been overhauled with oversize sleeve/piston sets that upgraded the M to 264, and the SM to 281. The serial# tag will be different. The SM will have disk brakes. Most, but not all, M tractors will have band-type brakes. Lambert disk brakes were installed on some, and sometime in the last year or so of the model run, IH disk brakes were installed on the M. The SM will have a faster gear ratio for 3rd and 4th gears. 3rd on the SM is very close to 4th on the M. The SM came in three stages. The first had the same Liftall (belly pump) hydraulic system as the M. Stage II offered Live Hydraulics. Stage III had the mounting holes in the rear casting that would later mount the IH "Fast-Hitch" system. The SMTA was a different model, but in some ways a fourth stage in preparation for the 400 model. The M came with a horizontal "Farmall" emblem on the front. The SH had a rectangular IH symbol. There may be some other less-obvious differences between the M and SM models.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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