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FORD recommends 80-90 straight gear lube in the front and 75w 140 synthetic in the rear. If you have some type LS unit in the rear you need the friction modifier. Not sure what "locker" you mean. You think the front end has some type of limit slip unit ? VERY uncommon.
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.