ARB RD217 Air Locker Locking Differential for Land Rover Discovery 3/4

The ARB RD217 Air Locker is a precision-engineered locking differential designed specifically for the front axle of Land Rover Discovery 3 and Discovery 4 vehicles. As the world's premier traction aid, ARB Air Lockers provide on-demand traction control that allows you to tackle the toughest terrain with confidence.

Key Features:

• Pneumatic activation provides instant engagement and disengagement for optimal traction control
• Engineered specifically for Land Rover Discovery 3 and 4 front axles
• Developed using proven technology from ARB's T6 Ranger and Mazda BT50 platform
• Maintains full OEM differential functionality when disengaged for normal street driving
• Durable construction designed to withstand extreme off-road conditions
• 100% lockup ensures both wheels rotate at the same speed for maximum traction

Unlike limited-slip differentials that can lose effectiveness over time, the ARB Air Locker provides consistent, reliable performance throughout its service life. When activated, it locks both wheels together to provide equal torque distribution, preventing wheel spin and keeping you moving forward through mud, sand, snow, and rock. When disengaged, your differential operates exactly as the manufacturer intended for smooth on-road handling and turning.

The RD217 was developed when ARB engineers recognized the dimensional similarities between the T6 Ranger/Mazda BT50 and Land Rover Discovery Series 3 differentials, differing only in ring gear diameter. This cross-platform engineering approach ensures proven reliability and performance backed by ARB's decades of off-road expertise.