Low Range Operation

In low range, the torque output from the automatic transmission is passed to the transfer case input shaft. The shifting sleeve is moved rearwards and connects the planetary ring gear to the transfer case housing. The torque from the automatic transmission is now directed through the sun gear of the epicyclic gearset and, via the pinion gears and pinion gear shafts, into the planetary carrier. The annulus gear of the epicyclic gearset is secured inside the casing and generates the low range ratio of 2.93: 1. The torque is then passed, via the shifting sleeve, to the differential housing where it is split between the two side gears. One side gear is connected by splines and passes the torque to the rear output flange. The second side gear is connected to the chain drive sprocket and passes the torque, via the drive chain, to the front output flange. The vehicle will remain in the selected range unless the driver requests a change, for example it will not automatically revert to high range following an ignition off/on sequence.