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The A was the first to become a Super in late 1947, and the biggest single change in that case was the addition of not only hydraulcs but live hydraulics. Make note, that also about same time C production began, and it began production with that same live hydraulic system and C-113 engine as the Super A. From there on it is not so cut and dried, C went to being a Super in 51 with an increase of 10 cubic inches to 123 cubic inch, with water pump, brakes changed from band to disc. The H and M also received larger engines, disc brakes, and an evolution from belly pump hydraulics, to optional live hydraulics to standard live hydraulics. M was the next to become a Super in 52 while the H did not become a Super until 53. It is hard to pin point exact dates as some of these improvements did not occur on the exact date of model change. It is reported that some late model Cs had the larger engine. Same with H, my dad had a late model 51 H with IH disc brakes. We also suspect it had the C-164 Super H engine rather than the C-152, known as standard in the H. We also had a 300 with the C-169 engine. Our H was just too close in power to 300 to be absolutely sure On the other hand I have a Super A with C-113 engine, 130 and 140 with C-123 engine. I see little difference in the three when it comes to lugging ability. There were also various changes in wheels both front and rear which happened near the change to Super in all cases but again not necessarily the exact date of model change. You best buy one of the books written on this matter, as that is what it would take to describe all.
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