Well, here's my .02....

The VR-4 is equipped with a full time all wheel drive system. It directs power to a center differential that incorporates a limited-slip viscous coupling. In normal driving conditions when the front and rear tires are getting equal traction, the torque split is 45 percent front and 55 percent rear. As a result, the VR-4 maintains a rear-drive handling bias under normal conditions. When there is a difference in the rotational speed of the front and rear wheels, addition torque is sent to the axle with great raction, which, in this case, would be the wheels that are turning more slowly. The rear limited slip differential works in the same way, as it shifts power left to right according to the traction of each rear wheel. Regardless of the traction conditions, the AWD system shifts torque so quickly and smoothly that the driver senses no unusual power transfer.