Today I spoke to my 90 year old uncle who has always been my tractor guru, he has farmed with and owned international farmall tractors for the better part of 70 years, most likely more. He presently has 5 M's, 1 C, 1 H and several Cubs an F12 a few Allice Chalmers, 4 John Deere's and a few others. Anyway he said that he believed that the power steering was offered as an aftermarket add on, not factory installed but as a dealer install.
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