In driving force controlling apparatus and method for a four-wheel drive vehicle, a driving force distribution controller determines whether there is a vehicular driver's demand on the driving force, calculates a driving force distribution ratio between fr...

A controllable, multi-mode, bi-directional overrunning clutch assembly (58) and a mode shift system (60) are adapted for use in a transfer case (16) for transferring drive torque from a primary output shaft (18) to a secondary output shaft (32) so as to es...

In case there occurs a wheel slip in either one of front left and right wheels or rear left and right wheels, a traction control through an engine output and a traction control through braking are implemented. Furthermore, in case the vehicle speed is slow...

A drive gear (37) having integral drive teeth (37a) is rotatably mounted on a transmission shaft (36) for transmitting power to front wheels, and a movable clutch member (52) having integral driven teeth (52a) engageable with the drive teeth is slidably bu...