Description
The ARB Air Locker Differential (ARB RD259) is the premium traction upgrade for 2011–2021 RAM 1500 trucks with the 31-spline, 9.25-inch ZF rear C-Clip axle. Engineered to provide 100% traction on demand, this pneumatically operated locker engages with the flip of a dash-mounted switch—instantly locking both axle shafts together for maximum grip.
When traction isn't needed, the locker disengages automatically, allowing the differential to operate like a standard open diff—ideal for everyday driving. The ARB RD259 is constructed with a durable two-piece design featuring minimal moving parts, increasing reliability in all terrains and conditions.
The kit includes the Air Locker, activation switch, solenoid valve, airline, and bulkhead fitting. An ARB air compressor is required (sold separately) for operation.
Features and Benefits:
- 100% Traction On Demand – Instantly locks rear wheels for maximum off-road grip
- Pneumatic Actuation – Engages from inside the cab via dash-mounted switch
- Two-Piece High-Strength Design – Reinforced for heavy-duty use with minimal wear
- High-Speed Engagement – Lock or unlock at any vehicle speed
- Extreme-Temperature Seal – Steel-reinforced elastomer annular seal resists heat, cold, and debris
- Comprehensive Kit – Includes locker, solenoid, switch, airline, and hardware
Color & Material:
- Color: Silver
- Material: Steel
Included Components:
- 1 × ARB Air Locker Differential (RD259)
- Activation switch
- Solenoid valve
- Airline
- Bulkhead fitting
Warranty:
-
5-year manufacturer warranty
CA Prop 65:
-
Not applicable
Vehicle Fitment:
Compatible with 2011–2021 RAM 1500 trucks equipped with:
- Rear Axle Type: 9.25-inch ZF C-Clip
- Spline Count: 31 spline, 1.35" axle shaft diameter
- Supported Models/Trims: Big Horn, Express, HFE, Laramie, Laramie Longhorn, Limited, Lone Star, Outdoorsman, Rebel, SLT, Special Service, Sport, ST, SXT, Tradesman, TRX
- Fuel Types: Gasoline, Flex Fuel, Diesel, MHEV (Mild Hybrid Electric Vehicle)
- Body Styles: 2-door and 4-door configurations
Important: Please confirm your rear axle type and spline count before ordering to ensure proper fitment.
