At steady cruising speeds, up to fifteen percent of available torque is sent to the rear wheels.

Normally, the system sends 70 percent of the power to the rear wheels.

While cruising, the system sends 90% of the power to the front wheels and 10% to the rear wheels.

Power may be sent to either the rear wheels or the front wheels.

If slipping is detected at the front, more power will be sent to the rear wheels in a fraction of a second.

On the road, with the 2.3-liter four cylinder sending 150 horsepower to the front wheels, the 900 S was no screamer.

On the S80, most of the power is normally sent to the front wheels, until slippage is detected.

If you choose four-wheel drive, your job still isn't done, because there are three ways to send power to the wheels.

The 6-liter V-8 can send more than 300 horsepower to the rear wheels.

Sending a lot of power to the wheels that steer makes for twitchy handling and lower performance limits.