The heart of the 4MOTION AWD system is this beast right here. The rear differential and the Haldex coupling contained within. The Haldex coupling is an electro-hydraulic clutch system that can vary lockup almost infinitely to vary torque split from front to rear. This AWD system uses very advanced predictive controls that will send power where it needs to be based on all of the information it has such as speed, direction, steering input. This system works very well.