ARB RD128 Air Locker Differential 24 Spline Banjo 3.54 Ratio

The ARB RD128 Air Locker is a pneumatically-operated locking differential designed for Land Rover vehicles with 24-spline banjo-type axles and 3.54 gear ratios. This premium traction solution delivers 100% lockup on demand while maintaining normal open differential operation during highway driving, making it ideal for serious off-road enthusiasts who need maximum traction without compromising daily drivability.

How It Works:

The Air Locker uses a pneumatic locking mechanism that, when activated via a dash-mounted switch, prevents the differential gears from rotating independently. This locks both axle shafts to the ring gear, ensuring both wheels receive equal power regardless of traction conditions. When unlocked, it operates exactly like a conventional open differential. The system requires a 12-volt ARB air compressor (sold separately) for operation and engages or disengages in approximately 0.1 seconds.

Key Features:

• 24-spline banjo-type configuration for Land Rover applications
• Compatible with 3.54 gear ratio axles
• State-of-the-art two-piece design with forged gears for superior strength
• Constructed from nodular iron for exceptional durability
• Patented gear technology ensures optimal locking strength
• Minimal moving parts for maximum reliability
• Instant activation at any speed with the flip of a switch
• Operates with standard differential fluid—no special additives required
• Made in Australia to exacting quality standards

Complete Kit Includes:

• Air Locker differential assembly
• Activation switch for dash mounting
• Solenoid valve
• Air line for pneumatic operation
• Bulkhead fittings

Installation and Maintenance:

Installation should be performed by a qualified differential technician, though no special tools beyond those required for standard differential work are needed. The Air Locker requires no additional maintenance beyond the manufacturer's recommended differential service intervals. An ARB air compressor (available separately) is required for operation and can also be used for tire inflation and other pneumatic tools.

The ARB RD128 allows you to tackle rock, sand, mud, snow, and other challenging terrain with confidence while reducing reliance on momentum-based techniques that can cause vehicle damage. Whether you're navigating technical trails or need reliable traction for remote work applications, this differential locker provides the performance and durability that have made ARB the world's premier traction aid manufacturer.