The Aussie Locker is a fully automatic and precision manufactured automatic differential locking device that does not require any manual operation to activate. It does not require any switches, external compressors, electrical cables, air lines, or pneumatic controls. It is positive locking, meaning there is no slippage when locked. There is a mechanically solid engagement of all parts. In contrast a limited slip differential is not positive locking and does allow slippage and one wheel "spin up" i.e. the spinning of one wheel at twice the differential speed while the other wheel having traction remains motionless. With the "Aussie Locker" you get 100% of drive and traction to both wheels.