Subaru celebrates 40th anniversary of All-wheel drive

SAWD was introduced in 1972 on the Leone wagon in Japan. In the ensuing years, Fuji Heavy Industries (FHI), the maker of Subaru vehicles, has hugely refined the technology.

Total production of Subaru SAWD vehicles has reached 11,782,812 (as of January 31, 2012) - approximately 55.7% of Subaru vehicle total sales.

The SAWD system provides optimum traction by distributing engine power to all four wheels in a balanced manner.

Subaru's AWD system combines the centre differential with an electronically controlled hydraulic multiple-disc clutch Limited Slip Differential (LSD), using the planetary gear. The 45:55 front/rear torque distribution is continuously variable, using a multiple disc clutch LSD. Torque distribution is controlled automatically up to an equal 50:50 front/rear ratio to suit road surface conditions. The system usually distributes torque 60:40 front/rear. It maximises the benefits of AWD by providing stability and safety, regardless of the driver's skill in any driving situation.