Duramax® 6.6L Turbo-Diesel V8 engine

Whether your job requires towing, hauling or simply roaming around rugged terrain, you need the Duramax® 6.6L Turbo Diesel V8 with 525 lb-ft of torque and 260 hp. Harnessing all this power is a big job, so it requires the durable 6-speed automatic transmission. It also requires a 145-amp alternator and 3.54 rear axle ratio. Requires 3500 models and 12- or 15-passenger seating.