Air Locker Differential Ford 9" CompetitionThe Ultimate Traction Upgrade: 100% Lock at the Flip of a Switch. The ARB Air Locker is widely considered the gold standard in traction technology. Unlike limited slip differentials that can slip when a wheel lifts, or automatic lockers that click and bang around corners, the ARB RD99CE gives you total control. With the flip of a dashboard switch, you go from a smooth handling open differential to a fully locked spool, sending 100% of the torque to
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