GERRY - The closest I've ever been to an IH 140 was the one my elementary school district used to mow ALL the school property all summer. Must have been an early 60's vintage. It covered a LOT of ground every summer, had a 60 or 72" belly-mounted rotary mower, probably a Woods since they were based in Oregon, IL only 60-70 miles away.
I saw a few inaccuracies in the article. Super M's & Super M-TA's had faster gear speeds than those listed which were correct for an M. SM's & SM-TA's had 2-1/2, 3-3/4, 5, 6-3/4, & 16-1/2 mph speeds & the SM-TA's Torque Amplifier lowered the low side speeds 33%. Those speeds may be off by as much as 1/4 mph due to tire size.
Thing I'm impressed the most with in that article is the way people kept track of that Super M. The history of Dad's '51 M is easy, bought new & delivered 12-23-1951 and stayed on the farm I grew up on till Nov/Dec. '72 then moved 1/2 mile away and stayed there for another 34 yrs till I hauled it to Wis. 4 yrs ago.
The Super H has had a little more "Colorful" history. Was bought new by a teacher in spring of '54 to farm 80 acres in an early attempt of "Subsistsnce Agriculture". Corn, beans, oats, hay, and enough livestock to butcher & feed His family. From what Dad told me years ago he went bankrupt and the tractor & equip. was repossessed before the crops were planted that spring. The tractor sat for a year at the dealership, and was used to deliver a new IH 4-row corn planter to the Big Time Operator down the road 3-4 miles spring of '55. The Super H proved to be a bit too small to pull the planter with ALL the options so was replaced spring of '56 with a 300 because it had a T/A and a bit more HP and the Super H sat mostly unused. The Super H was traded for a 756 with the German D310 diesel in the spring of '68 and Dad traded a '39 H for it in May '68 just before starting to plant corn. It pulled our little JD 4-row planter with no fertilizer boxes Dad had much better than the loaded IH planter.
Dad & an old Buddy of his delivered the Super H up to me here in WI late summer of '95.
The pilot bearing problem the article mentions was a true weak spot in the H/M's. The Super Series about doubled the size of the stub shaft & bearing, but souping-up an H or M and trying to pull big tillage equipment in 4th gear would snap the stub shaft off the main transmission shaft or overload the pilot bearing quickly. Running in lower gears, 2nd & 3rd, moved the meshing gears away from the pilot bearing and they lived much longer & happier lives.
M&W also offered 1/2" longer stroke crankshafts for the M,SM,400,450 engines, 5-3/4" stroke instead of the stock 5-1/4". The crank was a package with the special pistons required, raised wristpin bores. There's a few M's around still running with those stroker cranks. 70 HP was common from those tractors.
We've had discussions on RPM's site about the fact IH should have made a rowcrop version of the W-9 series, 335 & 350 CID 4-cyl. engines. Later a version of the diesel engine was made @ 370 CID. Since the W-9 series was a totally different chassis design than the H/M it could have been redesigned to have live hyd, PTO, heavier drivetrain, more speeds, stronger axles, and hopefully T/A which the W-9 family never had, even into the late 50's with the 600/650. It would have been the logical chassis for IH's first 6-cyl. tractor engines instead of the updated M rearend used in the 560. Would have probably eliminated the 560 rearend fiasco which caused a lot of farmers to go green. IH was building some really good in-line-6 engines for trucks, 401, 450, & 501 CID. Even IH's biggest ever gas tractor only used a 301 cid engine. IH could have broken into the 100 HP ag tractor market a decade before the competition with both gas & diesel engines.
The article mentioned M&W brochures, they actually put out a nice catalog that I used to have of ALL their parts from about 1965. Most of the stuff for the letter series Farmall's was gone by then but they still had a LOT of cool stuff!