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You should be able to fit a 35x12.5 with no problems, that is what I have on mine. You could probably go a little taller, maybe even up do a 37 depending on how worn the springs are. Here's what mine with 35s looks like, though I have longer shackles in the front to level it out a little.
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.
