1999 Peterbilt 378. 500HP Cummins N14 Redtop. 13 Speed Transmission. Only 318,000 Original Miles. 44,000LB Rears. Double Framed. Air Trac Suspension. Dual Line Wet Kit. Loaded Interior. Gauge Package. Air Slide Fifth Wheel. 11R22.5 Tires. Aluminum Rear Fenders. Aluminum Headache Rack. Strobe Lights. Engine Brake. Cruise Control. Clean Peterbilt 378