Subject to intensive testing by engineers and competition users for over 20 years, TJM's Pro Locker is near indestructible. It's designed specifically to suit the front of Landrover Range Rover with P38A front axle and 24 spline rear axles. For double the traction fit a Pro Locker to the front and another to the back for unbeatable performance. Our innovative design locks wheels with loss of traction allowing the other wheels to work harder to get you out. Even though you've purchased a 4x4, the factory differential is primarily designed for road use. The Pro Locker provides maximum traction and drive to all four wheels giving you the best possible chance of tackling formidable terrain. With a TJM Pro Locker installed, you may never get stuck again!