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Allisons are very tough transmissions. The 3000 and 4000 models are not limited by weight, only by HP and torque...they can tow anything. The 3000 is limited to 450 HP and 1250 ft/lbs of torque. The limits for the 4000 are 650/1950. We used to have a motor home with a 3000 in it, never a problem.
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