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The Sterling 10.5 rearend can be ordered with a factory dog-clutch E-locker-though no ring-and-pinion gears lower than 3.55:1 are available from the factory unless you spring for the dually version, which can be outfitted with 3.73:1s. Even so, the locker should be considered a must-have on the trail for a 6,400-pound pickup truck with street-biased rubber. The Super Duty also comes from the factory with transfer-case and fuel-tank skidplates, which both come in handy when the road gets rocky.