ARB RD139 Air Locker for AAM 11.5in 30 Spline - Select Chevrolet, GMC, and Ram 2001-2019

Fits select 2001-2019 Chevrolet Silverado/GMC Sierra 2500/3500 and Dodge/Ram 2500/3500 heavy-duty trucks with the AAM 11.5-inch rear differential.

The ARB RD139 Air Locker is a pneumatically operated locking differential that provides 100% traction on demand. By replacing the internal differential carrier, it allows the driver to toggle between a conventional open differential for on-road drivability and a fully locked axle for maximum off-road performance. When activated via a dash-mounted switch, the internal gears are locked, forcing both axle shafts to rotate at the same speed regardless of ground resistance. This eliminates wheel spin on uneven terrain, mud, or rock, allowing for a slower and more controlled driving style that reduces vehicle stress and driveline wear.

• Carrier Design: Ultra-durable two-piece design with a patented timed locking mechanism for high strength and fast engagement.
• Annular Seal: Steel-reinforced, elastomer-bonded seal engineered to withstand extreme temperature ranges.
• Included Components: Air Locker differential, activation switch, solenoid valve, air line, and bulkhead fitting.
• Spline Count: 30 Spline
• Differential Diameter: AAM 11.5 inch
• Manufacturer Part Number: RD139

Note: An on-board air compressor is required for operation (sold separately).