The Jeep Grand Cherokee WJ SUV made its debut in the 1999 model year and ended its five-year presence on the Jeep dealer showroom floor in 2004. The Jeep Grand Cherokee WJ featured the rock-solid 4.0-liter Power Tech 12-valve, over head valve (OHV) I-6 engine. The SMPI engine boasted 195 horsepower and 230 lb.-ft. of torque. The Chrysler Power Tech 4 Liter engine featured a new cylinder head in addition to a multitude of other improvements, including a redesigned water pump and new exhaust manifold. The optional power plant was the 4.7L Power Tech V8 engine. This engine was a 16-valve, single over head cam (SOHC) motor that. The SMPI V-8 cranked out considerably more power that amounted to 235 horsepower and 295 lb.-ft. of torque.