The 'F' in the 2013 Ford F150 FX4 stands for 'Ford,' as you might expect. Until the early 2000s, Ford's upgraded 4x4 was referred to as the 'Off Road Package.' However, someone from Ford had the wonderful idea to sneakily rename their premium 44 packages to 'FX4' in 2002. A restricted slip rear end, stronger Ranchero shocks, and an upgraded suspension are typical FX4 upgrades. The majority also offer automatic 44 shifting on the steering wheel.