While it may share the same F-Series name as its predecessor, the F-250 and F-350 were anything but modified F-150s. In 1999, Ford introduced a Super Duty platform more closely related to light commercial trucks than consumer-grade F-150s and Rangers. Testament to the difference between the two chassis, while the F150 got a complete redesign in 2004, the Super Duty line carried on with the same platform until 2007.
All trucks in the F-250 Super Duty line shared the same 8,800-pound gross vehicle weight, but curb weights could vary by nearly 1,400 pounds, depending on the truck's equipment, configuration and wheelbase. The lightest trucks sat on 137-inch wheelbases, and weighed in at about 5,420 pounds. Specifying a Super Cab meant upgrading to a 142-inch wheelbase, which increased mass to about 5,600 pounds. Super Cab trucks with 158-inch wheelbases started at about 5,760 pounds, and the longest 172-inch-wheelbase trucks tipped the scales at about 6,000 pounds even. Specifying the V-10 adds about 100 pounds, and the big Powerstroke diesel adds about 300 pounds over the base V-8. Four-wheel drive adds about 400 pounds. Add all that up, and you could see as much as 6,800 pounds on a long-wheelbase truck with a Powerstoke and four-wheel drive.