87-90 - 4.0L I6 "Power Tech" Renix engine
177 hp @ 4750 rpm, 224 ft lb @ 2400 rpm/220lbft @ 2000rpm
91-95 - 4.0L I6 MPI "Power Tech HO" (High Output)
190 hp @ 4750 rpm, 225 ft lb @ 3,950 rpm
96-99 - 4.0L I6 MPI "Power Tech HO" (High Output) (OBD-II)
190 hp @ 4600 rpm, 225 ft lb @ 3,000 rpm
00-01 - 4.0L I6 MPI "Power Tech HO" (High Output) (distributorless)
193 hp @ 4600 rpm, 231 ft lb @ 3,000 rpm