The Ford F-450 Super Duty increases the F-450's gross combined weight rating (GCWR) by 15,000 kg. It ups the GCWR from 26,000 to 33,000 kg. The F-450 Super Duty offers a powerful 6.4 L V8 Power Stroke Sequential turbo diesel engine. If you need a truck that can city drive while withstanding even the largest loads, this is the one for you.