An air locker is a differential that physically locks the two wheels on an axle to spin together when activated. ARB's design uses compressed air to engage a clutch ring. Off, you have an open or limited-slip diff. On, both wheels spin equally, perfect for rocks, slow climbs, and any time one tire lifts.

A rear locker handles 80% or more of off-road situations. Adding a front locker unlocks the rest: tight technical terrain, off-camber climbs, hill-descent control with both axles working. Most builders start rear and add front later.

Locker, carrier, bearings, compressor, air manifold, lines, fittings, switch panel, and wiring. We set up the diff with proper preload and pattern. Pattern verification photos available on request.

Yes, when installed correctly. ARB has a 30-plus year track record. The most common ARB issues are install errors (poor air-line routing, miswired solenoids), not the lockers themselves. We've installed enough of these to know every common mistake and avoid them.

Single locker (rear): one shop day for install, plus a half day for compressor and panel. Front + rear with twin compressor: 2-3 shop days.

Possibly, if you have a press, dial indicators, the right backlash specs, and patience. The locker itself is straightforward. The diff setup is not. Most DIY ARB installs we see in the bay later have backlash issues or pattern issues. Bring it in if you are not 100% confident.