Leon: All IH plows built at Hamilton ON Canada, had adjustable frames and could be adjusted. In most cases there were 2 different size frames. Small would adjust 10", 11", 12" and 14". The large frame would adjust 12", 14" and 16". That is not to suggest you could use all settings. There were 3 sizes of frogs and moldboards Small could be used 10", 11" or 12" , medium 12" or 14 " and large 14" or 16". My two bottom fast hitch plow for 140 has setting from 10 to 14 inches on frame, the moldboards however will only plow 10", 11" or 12". This design made it possible to make up numerous plows from given warehouse stock. If your in Canada, information Hal, Allan and Rusty have given you is quite likely wrong. Rusty knows this. If you are near the border on either side, it could be either way. The US built plows prior to 1960 have diagnol cross members in plow frame. The Canadian built plow has perpendicular cross members that are made of 2 pieces of steel that overlap. On trailer plows the Canadian plow has a reduction cog on each lever giving you finer settings. The lever is two piece hinged in the middle with 3 settings at this point, thus allowing you to switch quickly from a Farmall to a W series tractor and still have lever within reach.
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