I used to work as an engineer in International"s truck group, and I don"t know exactly what the differences are. As someone already noted, I"m sure the 4900 is generally considered more heavy duty. Probably the "standard" configuration of the 4900 has heavier frame rails and various other features. However, with medium and heavy duty trucks there is a lot of room for customization of each model, with the result that you could probably build two different models to be virtually identical (except for the model number badge, of course). In short, the model number itself won"t tell you a great deal about those trucks. Need to really look at how they"re optioned (GVWR (as you noted), engine, transmission, frame rails, suspension, etc.), everything"s custom with these trucks.
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Today's Featured Article - Grain Threshing in the Early 40's - by Pat Browning. The setting is rural Wisconsin, halfway between East Troy and Elkhorn, on Hodunk Road, our nation was at war, and I was 6, 7 and 8 years old. George was our "threshing neighbor." He was the one with the threshing machine, a JI Case on steel wheels, and he pulled it to our farm with a JI Case standard tractor also on steel. In those days, steel wheeled implements were common. The roads were general gravel, so the lugs cutting into them wasn't a problem. George would set up the thresher, s
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