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Most Rangers came with either the 7.5 or 28-spline 8.8, which use the same bearings. Only a few, namely the FX4 models, came with the 31 spline 8.8. The parts store computer SHOULD list all three options, but it's possible and likely the computer erroneously omitted one or more of those options.
In the future, if you're looking for rear bearings or seals, just lie to the parts guy and tell him you have a 7.5.
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.