4900EX LOWMAX, Heavy Duty Trucks - Glider Kit Trucks, Detroit 12.7L, 13 Spd, Low Max Glider Kit! Powered by a Series 60 DET 500HP, EPA 98 Technology! 13 Speed Transmission, 500 Horse Power, Air Ride Suspension, Aluminum Wheels, 260 Wheel Base, LP24.5, Tandem Axle, Ratio, 54 Flat Top Sleeper