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It must have the Heavy Duty 3-sp or a 4-sp crashbox. The diff ratio was originally on a metal tag under one of the bolts on the back cover of the diff. Not unusual for it to be missing. I haven't heard of them being stamped with the ratio, counting teeth would be the definitive way.
Rezvani's Latest Post-Apocalytic 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.
