2012 Jeep Grand Cherokee Owner Manual - Page 445

STARTING AND OPERATING 443 When additional traction is required, the 4WD LOW position can be used to lock the front and rear driveshafts together and force the front and rear wheels to rotate at the same speed. The 4WD LOW position is intended for loose, slippery road surfaces only. Driving in the 4WD LOW position on dry, hard-surfaced roads may cause increased tire wear and damage to driveline components. When operating your vehicle in 4WD LOW, the engine speed is approximately three times that of the 4WD HI position at a given road speed. Take care not to overspeed the engine and do not exceed 25 mph (40 km/h). WARNING! You or others could be injured if you leave the vehicle unattended with the transfer case in the N (Neutral) position without first fully engaging the parking brake. The transfer case N (Neutral) position disengages both the front and rear driveshafts from the powertrain and will allow the vehicle to move regardless of the transmission position. The parking brake should always be applied when the driver is not in the vehicle. 5 Proper operation of four-wheel drive vehicles depends Shift Positions on tires of equal size, type, and circumference on each For additional information on the appropriate use of each wheel. Any difference will adversely affect shifting and transfer case mode position, see the information below: cause damage to the transfer case. 4WD AUTO Because four-wheel drive provides improved traction, This range is used on surfaces such as ice, snow, gravel, there is a tendency to exceed safe turning and stopping sand, and dry hard pavement. speeds. Do not go faster than road conditions permit.