Cummins® ISM 500 Electronic Engine with Allison® 4000 MH 6-Speed World Transmission and Electronic Shifter torque: 1550 lbs./ft. Max. Net at 1200 RPM ear Axle Ratio: 4.30:1 Cubic Inch Displacement: 661”/11.0L 200 Amp Alternator Dual Fuel Fill Polished Aluminum Wheels Tires: 295/80R/22.5H Cushion Air Glide Suspension with Ten Outboard Mounted Air Springs and Ten Bilstein Shock Absorbers Six Wheel Anti-Lock Braking System with Front Disc Brakes and Rear Drum Brakes Tag Axle with Anti-Lock Braking System Automatic Traction Control Two Stage Jacobs Engine Brake Auto Slack Adjusters Fuel/Water Separator Transmission Temperature Gauge Transmission Oil Cooler Rear Aluminum Side Mount Radiator and Inter-Cooler Air Cleaner Restriction Indicator Engine Block Heater with Switch on Dash Automatic Air Leveling System 10,000 lb. Hitch Receiver with 7-Way Hitch Plug Undercoating Options Hydraulic Leveling System Dual Leveling Systems (Air/Hydraulic)