579, Heavy Duty Trucks - Conventional Trucks w/o Sleeper, Cummins ISX15, 13 Spd, New 2016 Daycab tractor. Cummins 485/1650 with 13 speed transmission, Platinum interior trim with Navigation System. Ready to work. Call now for detailed specs and a credit application., 485 Horse Power, Air Leaf Suspension, Aluminum/Steel Wheels, 190 Wheel Base, 22.5 LP, Tandem Axle, Ratio,