2005 Jeep Grand Cherokee Owner Manual - Page 240

240 STARTING AND OPERATING and Traction Control, provides resistance to any wheel that is slipping to allow additional torque transfer to wheels with traction. NOTE: The Quadra-Trac I௡ system is not appropriate for conditions where LOW range is recommended. Refer to "Off-Road Driving Tips" in this section. Quadra-Trac IIா Operating Instructions/Precautions - If Equipped The Quadra-Trac II௡ transfer case is fully automatic in the normal driving 4 HI mode. The Quadra-Trac II௡ transfer case provides three mode positions - four wheel drive high range, neutral, and four wheel drive low range. This transfer case is fully automatic in the 4 HI mode. This transfer case divides engine torque almost evenly with 48 percent of engine torque to the front axle and 52 percent of engine torque to the rear axle. When speed differences are increased between the front and rear drive shafts, the transfer case can transmit up to 100 percent of available engine torque to the front or rear drive shafts. When additional traction is required, the 4 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 4 LOW position is intended for loose, slippery road surfaces only. Driving in the 4 LOW position on dry hard surfaced roads may cause increased tire wear and damage to driveline components. When operating your vehicle in 4 LOW, the engine speed is approximately three times that of the 4 HI position at a given road speed. Take care not to overspeed the engine and do not exceed 25 mph (40 km/h). Proper operation of four wheel drive vehicles depends on tires of equal size, type, and circumference on each wheel. Any difference will adversely affect shifting and cause damage to the transfer case.