Designed and manufactured in Australia, the ARB Air Locking Differential patented design has proved ultra reliable, even under the most arduous conditions. The Air Locking Differential is certainly very strong, with all transmission components being cleverly designed and manufactured from the highest quality materials. The Air Locking Differential is machined and built at ARB's Melbourne plant using the latest CNC equipment, and assembled under the guidelines of our stringent quality control system. Without diff locks, when one wheel loses traction, all the driving torque transfers to that wheel leaving it spinning helplessly. With the ARB Air Locking differential activated you will simply drive out of these situations. Once off the road, by simply pushing the buttons, the Air Locking Differentials lock the axles together providing 100% traction to all wheels allowing you to safely traverse even the most difficult terrain.