Duramax 6.6L V8 Turbo Diesel engine

  • 525 lb-ft of torque @ 1600 rpm and 260 hp at 3100 rpm
  • Option of filling up with B20 bio-diesel fuel
  • 6-speed automatic transmission
Requires available 145-amp alternator and 3.54 rear axle ratio. Some models require 9600-lb. GVWR and 12-passenger seating, while others require 9900-lb. GVWR and 12- or 15-passenger seating.1. 1 When properly equipped; includes weight of vehicle, passengers, cargo and equipment.