ARB Air Locker — Nissan H233B (31-Spline)
An open differential sends torque to the wheel with the least grip, so the moment a tire lifts on the trail you stop making progress. The ARB Air Locker for the Nissan H233B rear axle solves that with a driver-selectable, air-operated lock: flip the switch and both wheels drive together for 100% traction, switch it off and you keep quiet, predictable open-diff manners on the highway.
This carrier is built for the 31-spline H233B differential used across Nissan's D21 Hardbody, Frontier, Xterra and Pathfinder platforms. Because engagement is on demand, you get a fully locked axle exactly when the terrain calls for it — no permanent handling or tire-wear penalty the rest of the time.
- Selectable, air-operated 100% differential lock
- Forged internals sized for the H233B 31-spline axle
- Engages instantly from an ARB air source (compressor or tank)
- Bolt-in replacement for the factory carrier
Trade-off: an Air Locker needs a compressed-air supply, so budget for an ARB compressor if you don't already run one, and have the carrier professionally installed and set up to your ring-and-pinion.
| Specification | Detail |
|---|---|
| Type | Selectable air-operated locking differential |
| Differential / axle | Nissan H233B (rear) |
| Spline count | 31 |
| Actuation | Compressed air — ARB air source required |
| Operating pressure | 100 psi (nominal) |
| Part number (MPN) | RD136 |
| GTIN | 881348007308 |
| Brand | ARB |
Fit is determined by your differential type and spline count, not model year — confirm your H233B axle before ordering. Browse more Differentials & Lockers or the full ARB collection.
Prop 65 Warning: This product can expose you to chemicals known to the State of California to cause cancer and/or reproductive harm. For more information go to www.P65Warnings.ca.gov.
Presented by Overland Kitted
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