Ford engineers improved the Super Duty chassis cab by making the frame out of high-strength steel and the body out of high-strength, military-grade, aluminum alloy. Components such as axles, hubs and brakes are larger and stronger to haul and tow bigger loads. The 6.7-liter Power Stroke® turbo diesel will produce the most combined power and torque ever in a Super Duty. Technical features are more advanced than before. This gives you the toughest, smartest and most capable Super Duty chassis cab ever.