Four Wheel Drive High Range

When the transfer case is in Four Wheel Drive High Range mode, the engine torque is transferred from the input shaft through the planetary gearset. The planetary gearset is driven as one unit providing the torque to the rear output shaft, through the rear differential to the rear wheels. To drive the front wheels one of the selector forks engages a selector ring to lock the silent chain gear wheel to the rear output shaft which drives engine torque to the front output shaft via the silent chain. Engine torque is the delivered to both the front and rear wheel without any gear reduction.