The 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 both wheels simultaneously.
At Overland Truck Store, we recommend ARB Air Lockers for builds that need to do it all. Whether you are navigating a tight technical trail in the Cascades or driving on snowy pavement, the ability to turn your locker off is just as valuable as turning it on. This "Selectable" design saves your tires from premature wear and reduces drivetrain stress during daily driving.
The RD99CE is specifically engineered for the legendary Ford 9-inch axle. Built with forged steel internal gears and a patented two-piece design, it is incredibly strong and designed to handle the abuse of high-torque engines and large tires. This is the traction aid that allows you to crawl slower, drive smoother, and conquer obstacles that leave open-diff vehicles spinning.
Features & Specs:
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Application: Ford 9-Inch Axle.
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Axle Shafts: Fits 31 Spline axles.
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Type: Pneumatically controlled "Selectable" Locking Differential.
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Instant Action: Engages and disengages instantly at any speed (though low speed is recommended).
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Durability: Features forged gears and a simplified two-piece design for maximum strength.
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Kit Includes: Differential, activation switch, solenoid valve, air line, and bulkhead fittings.
Installer Note: This is an Air Locker, which means it requires an onboard air compressor (sold separately) to operate. The installation involves drilling and tapping the third member housing for the air line bulkhead fitting. Professional installation is highly recommended, as proper gear mesh and backlash settings are critical for the Ford 9-inch setup.