ARB RD-138 Air Locking Differential
When crossing rough terrain, you will get stuck and lose wheel traction. Your standard differential directs all the vehicles power to the wheels that have the least amount of resistance. I.e. If you have one wheel in the air, your standard diff will direct most of the power to the wheel that is in the air leaving the other wheel stationary.
When you engage the land rover diff locker, it locks the differential so that the vehicles power is distributed evenly to the tyres regardless of which one has the less resistance.
This will ensure you have maximum traction at all times and it will get you out of most sticky situations. ARB locking differentials allow the driver to control traction by locking the driveshafts in the axle together, meaning you can driver further and avoid trouble.
RD138 to fit Land Rover 24 spline axles on vehicles such as Range Rover P38,
Td5 110 Rear from 2002