Drive system for automotive vehicle of front-and-rear wheel drive type

A drive system for an automotive vehicle of the front-and-rear wheel drive type, comprising a primary drive mechanism (10a) for drive of a set of front road wheels (13e) and an ancillary drive mechanism (10b) for drive of a set of rear road wheels (19d), wherein the front road wheels are driven by operation of the primary drive mechanism at a two-wheel drive mode and wherein the front and rear road wheels are driven by operation of both the primary and ancillary drive mechanisms at a four-wheel drive mode. In the drive system, a drive power applied to the primary road wheels is restricted to a predetermined value when the vehicle is driven by the primary and ancillary drive mechanisms at the front-and-rear wheel drive mode.