2013 Jeep Grand Cherokee Owner's Manual - Page 469

STARTING AND OPERATING 467 control, when the transmission is sufficiently warm, will Torque Converter Clutch demonstrate that the transmission is able to shift into and A feature designed to improve fuel economy has been out of Overdrive. included in the automatic transmission on your vehicle. A clutch within the torque converter engages automatically at • If the vehicle has not been driven for several days, the calibrated speeds. This may result in a slightly different first few seconds of operation after shifting the transmisfeeling or response during normal operation in the upper sion into gear may seem sluggish. This is due to the fluid gears. When the vehicle speed drops or during some partially draining from the torque converter into the accelerations, the clutch automatically disengages. transmission. This condition is normal and will not cause damage to the transmission. The torque converter NOTE: will refill within five seconds after starting the engine. • The torque converter clutch will not engage, and the transmission will not shift into the top overdrive gear, until the transmission fluid and engine coolant are warm [usually after 1 to 3 miles (2 to 5 km) of driving]. Because top gear is disabled, and engine speed is higher when the torque converter clutch is not engaged, it may seem as if the transmission is not shifting properly when cold. This is normal. Using the Electronic Range Select (ERS) shift FOUR-WHEEL DRIVE OPERATION Quadra-Trac I® Operating Instructions/ Precautions - If Equipped The Quadra-Trac I® is a single-speed (HI range only) transfer case, which provides convenient full-time fourwheel drive. No driver interaction is required. The Brake Traction Control (BTC) System, which combines standard 5