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I was underneath the truck today, changing my oil over to the beautiful green colored Schaeffers brand series 9000 full synthetic and I noticed a yellow X on the end of my front leaf springs. I took a pic but you can't make the X out too well. Trust me it's right there stamped in the middle of that yellow dot.
an easier way to tell if your truck has X code springs from the factory is to look at the warranty sticker on the B pillar. it will tell you what your springs are.
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.