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 - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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