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| I'd say the class size spread on a D6 is probably more like 3 classes when you go from old to newer. An old 6 might be pushing a bit better than 100 hp while a later machine is close to 180. An old, old 6 is probably loosely equivelant to a 4H in the 25K# range while a 6H can easily outclass an old 7C/D. Then you have all the variables of the 4/5/6 class tractors today with flat and high drive tracks, wide gaps in tonnage between the 'same' numbers, etc.
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dozers
