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Homochitto: The single biggest difference is the engine and some it's components. A factory original SA would have the C-113 engine while 140 has C-123 engine. The 140 will have a water pump although Super A could have had that added, however it is not the same water pump. Super A if it has water pump added, will have the pump over the bottom water outlet on the block, while the 140 has an automotive type pump mounted as the fan hub. I'm not certain that is an improvment. 140 in my opinion has an improved carb and of course larger air breather. The Super A engine can be upgraded to C-123 specs, at engine rebuild time. There are several other improvments that your Super A already has if it's later than 51-52 model. Steering box and ty rods were changed in early 52, big improvment. Brakes were changed and improved in late 53. Hydraulics were beefed up about the same time. I have both of these tractors, I like both of them. If you were to ask me which I prefer, that would be a hard question to answer. I also have a 130, however my 130 had seen a lot of hard work and today it shows compared to the other two. Bear in mind my tractors are not show tractors but rather working tractors I've kept in good mechanical condition. In my opinion the SA and 140 both had better sheet metal from the factory than the 100 or 130. In general including tractors other than my own, 100 and 130 sheet metal did not stay tight as well, it rusted more and those damn metal decals, have been a curse to keep tight. When they fall off, one usually plows them under before noticed. I don't think some components of the 140 are going to have the same longeviety as the Super A has. I see cases where IH was starting to nickel and dime this great tractor. As far a horse power is concerned, I see little difference in my three tractors in actual working field conditions. Now, bear in mind, my SA has 9.2x24 rear tires while the other two have 12.4x24. Those larger tires require more hp, but also give great flotation. These tractors are already quite fast in 1st and reverse, for certain jobs, large tires only make this worse. I like the mix for various jobs.
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