Southwest Diff lockers are the uk premier supplier of HF locking Diffs and compressors.
Based in Devon, specialising in Land Rovers and Range Rovers.

A diff locker, or differential lock, is a mechanism that forces both wheels on an axle to rotate at the same speed, instead of the standard differential that allows them to turn at different rates. This is crucial for off-road driving, as it ensures both wheels have traction, allowing a vehicle to move forward when one wheel is on a slippery or lifted surface. Diff lockers are typically engaged for challenging terrain and disengaged for normal road use.