PATHFINDER'S standard transmission is an electronically-controlled four-speed auto with lock-up torque converter. At the heart of the Pathfinder's part-time 4WD system is a hydraulically operated multi-plate clutch which - in response to input from sensors measuring such aspects as front and rear propeller shaft speeds, engine speed, throttle sensors and the anti-lock braking system - transfers drive to the front wheels as required to supplement the drive to the rear. The driver can switch to full-time 4WD on the dirt and use low-range when more challenging off-road terrain is encountered.