[gallery link="none" columns="1" size="full" ids="64730"] source: Audi AG Four rings, four driven wheels – a 40-year success story From the lockable center differential to electric torque vectoring Ahead of the competition: a triumph in motorsports and among customers The quattro drive has been a technical core area and pillar of Audi for 40 years now. The great success story ranges from the manually lockable center differential in 1980 to the three electric motors tha...