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NDS: All tractors need to have some slipage, it's the cushion that protects the powertrain. That one was one of the main bonus that came with rubber tires. Yes, I agree maybe the first 560s should have been beefed up a bit from M, 400 and 450 specs once 6 cylinders were put up front. However, I've seen many a 66 series tractor in the scrapyard, put there by transmission and rear end failure. The fact remains though we've all seen tractors out of the 60s and 70s with some awesome wheel weights, ie solid concrete that close to filled inside diameter of rim and wheel concave. Not many people realized this, however there was a warning in manual of 1066 and 1466 not to use the 3 lowest gears for maximum drawbar pull. Another one is these 300hp+ articulateds, customer best stick to ballast added at factory, or he may find he has no warrenty if one rear end fails. That one is computerized, and one doesn't add pound for pound front and rear. More rubber my friend is the way to put more hp on the ground. We ran into a situation here in Canada with Canadian ring chains. IH wouldn't stand behind warrenty on powertrain if those were used on European built tractors, yet they would on US built tractors.
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