7500, Heavy Duty Trucks - Dump Trucks, Caterpillar , 6 Spd, A 2005 GMC 7500 DUMP TRUCK. 46000 MILES CAT-250HP ENGINE. ALLISON 6 SPEED AUTO, AIR BRAKES, 33K GVW. 2 4 UNDER BED TOOL BOXES, NEW TIRES. VERY CLEAN AND WELL TAKEN CARE OF. 33K GVWR, 54K GCWR., 250 Horse Power, Suspension, Wheels, Wheel Base, , Axle, Ratio,