Bill: You got your answer, and probaby better than I would have done. One thing they didn't mention SMTA was drilled same as 450, and SMTA had no holes drilled in transmission cover for the 400 type hitch. While the 450 and 560 may have had draft control it wasn't a particularly good device. The manual draft control Jim speaks of, a second cylinder lieing just ahead of right axle carrier, controlled by a separate control valve did much the same function as raising front of hitch on your 140. To the guy with good judgement on that front hitch control, he out performed the 350,450, 460 and 560 draft control. He couldn't measure up to what IH developed on 06 tractors. IH went from the poorest draft control, (460-560) in the industry to the best draft control in the industry on 06 tractors. In my opinion no one has topped it since. Those 06, 56, 66 and 86 series tractors, you could feel it under you in the seat every time it activated, could be 3-4 times per minute in tough plowing. It was so quick, it litterly flattened the tires out giving you the sensation of the seat dropping from under you. And I wasn't going to say much.
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