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4x4=4x4 as far as the '04-'08 suspension goes.
"FX" is a trim level; FX4 has slightly larger wheels & tires, but not much difference as far as ride height. FX4 had standard LS differential (rear), 5.4L, skid plates, larger gas tank [than the lesser trims], and a "semi-pimp" interior.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.