ARB RD278 Air Locker Locking Differential

The ARB RD278 Air Locker is a pneumatically operated locking differential designed to deliver maximum traction in the most demanding off-road conditions. Unlike traditional open or limited-slip differentials, the ARB Air Locker mechanically locks both axle shafts together when engaged, forcing both wheels on an axle to rotate at the same speed and providing 100% torque transfer to both wheels simultaneously.

Engineered and manufactured by ARB to strict quality standards, the RD278 Air Locker is designed to be a direct OEM-fit replacement for the factory differential carrier, ensuring precise fitment and reliable long-term performance. When not engaged, the Air Locker functions exactly like a standard open differential, maintaining normal on-road handling and tire wear characteristics.

Key Features:

• 100% differential lock providing maximum traction on demand
• Pneumatically engaged via onboard air supply (compressor sold separately)
• Precision-machined internals for durability and long service life
• Direct OEM-fit carrier replacement for straightforward installation
• Functions as a standard open differential when not engaged — no on-road compromise
• Compatible with ARB's LINX and traditional air compressor systems
• Designed for use in front or rear axle applications (verify fitment)
• Manufactured to ISO 9001 quality standards

The ARB Air Locker system is trusted by off-road enthusiasts, overlanders, and professional four-wheel drive operators worldwide. Whether navigating rock crawls, mud, sand, or steep inclines, the ARB RD278 delivers the traction needed to keep you moving forward with confidence.