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From what I can find, it's mainly an appearance package for the Expedition, with the only performance part being the upgraded dampers. The rest of the package is cosmetic...
Quote: An FX4 off-road package ($4,185) is available on XLT models that features distinctive exterior cues that give it a more rugged appearance, including tubular steel running boards, foglamps, an FX4 badge on the liftgate. Unique 17-inch chromed steel wheels and all-terrain tires complement special shocks tuned for off-road performance.
Thanks, i do like the steel tube steps down the sides, and did notice the slightly firmer ride over bumps compared to an XLT. Didn't realize the price difference was quite so much.