Jeep offers three four-wheel-drive systems on the Grand Cherokee, and all three are the permanently engaged type. Quadra-Trac I, standard on four-wheel-drive Laredo models, splits power 50/50 between the front and rear axles, and there are no switches or levers to control the system.
Quadra-Trac II automatically transfers power from wheels that slip to the wheels that grip and can send 100 percent of torque to the front or rear axle. It has a two-speed transfer case (instead of single-speed) with a low range engaged by a dashboard switch for off-road driving. This system is standard on four-wheel-drive Limited and Overland models and optional on Laredos.
Quadra-Drive II also can transfer power front and rear and has a low range, plus it has an electronic limited-slip rear differential that apportions power between the rear wheels. Quadra-Drive II is standard on Overland models with the 5.7-liter V-8 and optional on Laredos. In addition, Quadra-Trac II and Quadra-Drive II come with Jeep's Selec-Terrain system, which allows setting the powertrain, brakes and suspension for different conditions — Sand/Mud, Snow, Rock, Auto or Sport.
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