Duramax 6.6L V8 Turbo Diesel engine

  • 525 lb-ft of torque @ 1600 rpm and 260 hp @ 3100 rpm
  • Option of filling up with B20 bio-diesel fuel
  • 6-speed automatic transmission

It also requires a 145-amp alternator and 3.54 rear axle ratio. This powerful engine is not available with the 105-amp alternator or the swing-out driver-side door option.