Brian - I restored a Super M a couple years ago, and finished a Super H this summer. Though they look identical, the H and the M share only about a half dozen parts: the steering wheel, seat, generator, voltage regulator, the electric box and the lights. Virtually EVERYTHING else is unique to the individual models. The tractors however are put together exactly alike - just the M parts are always bigger. The drivetrain on an M is no less durable than on an H - it's been sized to accomodate the higher horsepower is gotta handle. The statement that an M is more likely to be worked hard and worn out is not necessarily true - some of the most worn-out tractors I looked at before I got mine were H's For a restorer, each tractor has it's advantages: Everything on an H can be reached from floor level (you sometimes need a stool or stepladder to work on the top of an M) An H with the wheels set in takes up less space in the shop or garage. The H weighs about a ton less than an M - can be pulled on a trailer by most any size pickup. On the other hand, if you're gonna use it to do real drawbar work, the M has half again the usable power of an H. The M has a delightfully booming exhaust note, and when parked in the middle of a row of H's at a tractor show, M's often elicit comments like: "Geez that's BIG..." So the choice is yours - but either way you won't go wrong... Good luck!
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