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If you want to know what rear end your Aero has, look on the driver's side door jam for the tag with the VIN on it. It will also list several other bits of info, including your Rear Axle Code which will be a two digit code. You can translate that code here:
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.