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Especially as additional power and larger tires are added, upgrading your differentials is especially important. Possibly you've installed 37" tires and now notice you've lost considerable low-end power. A relatively simple fix to regain your powerband is with a set of lower gears. Or maybe you're tired of one tire fire and looking to upgrade to a selectable locking carrier, such as an ARB Air Locker...no problem! Whatever the case, we have numerous options to upgrade the running gear of your SuperDuty.