Each 2007 Audi Q7 is equipped with a six-speed Tiptronic automatic transmission driving all four wheels through Audi’s legendary Quattro permanent four-wheel-drive system. Quattro delivers traction in a 42/58 front/rear power split, ensured by its self-locking center differential. When the Q7’s wheels slip, Quattro can divert up to 65 percent of the engine’s power to the front wheels or, if necessary, as much as 85 percent to the rear wheels. Electronic differential locks brake individual wheels that are spinning to better control the apportioning of power and maximize traction. Audi says that by splitting power to favor the rear wheels, Quattro helps to negate torque steer when accelerating, and gives the Q7 a more sporting feel under normal driving conditions.