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I would highly recommend cleaning the slide pins. Having just replaced a caliper mounting bracket on my SD because of a siezed pin, I would make a point of checking it out. Pull them out, clean them up, make sure you put a good grease on them and reinstall.
How many miles on your rig? That would help to know what else to look at.
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.