America’s best-selling truck was all-new for 2004 with a fully boxed frame that was nine times stiffer torsionally than its predecessor’s. All cab configurations got four doors including he regular cab, which offered a decent amount of storage space behind the seats. There were three different bed lengths and five wheelbases available. Interior trim was improved so that the top-line FX4 and Lariat models looked more Lincoln like inside. There was a choice of two V8 engines including the new 5.4/liter 300-horsepower Triton V8. The previous F150 continued in production for several months and was sold as the Heritage model.