Abstract: The motor of an electric car has its armature coupled to one drive shaft and its case coupled to another drive shaft The front drive shaft drives the front axle, i.e. the front pair of wheels, through a differential; the rear drive shaft drives the rear axle, i.e. the back pair of wheels, through a gearbox and a differential The motor is normally energized to drive the two axles in the same direction. An electric auxiliary motor is coupled to the rear drive shaft from the main motor. The vehicle is operable in first and second modes in which the ratios of the front and back differentials (including effect of the gearbox) are respectively greater than and less than 1:1.