2010 Jeep Grand Cherokee User Guide - Page 41

OFF-ROAD CAPABILITIES FOUR-WHEEL DRIVE OPERATION Quadra-Trac I® Operating Instructions/Precautions • The Quadra-Trac I® is a single-speed (HI range only) transfer case, which provides convenient full-time four-wheel drive. No driver interaction is required. The Brake Traction Control (BTC) System, which combines standard ABS and Traction Control, provides resistance to any wheel that is slipping to allow additional torque transfer to wheels with traction. • 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). NOTE: • If shift conditions/interlocks are not met, or a transfer case motor temperature protection condition exists, a "CHECK SHIFT PROCEDURES" message will flash from the Electronic Vehicle Information Center (EVIC). Quadra-Trac II®/Quadra-Drive II® Operating Instructions/ Precautions 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. • The Quadra-Trac II®/Quadra-Drive II® transfer case is fully automatic in the normal driving 4WD HI mode. The Quadra-Trac II®/Quadra-Drive II® transfer case provides three mode positions: • 4WD HI • NEUTRAL • 4WD LOW • This transfer case is fully automatic in the 4WD HI mode. 39