The automatic unit on V8 models had an extra gear between second and third gears, to improve passing response and provide smoother downshifts. Grand Cherokee again offered rear-wheel drive and a choice of three 4WD systems--all usable on dry pavement. Selec-Trac, which could be shifted from 2WD to 4WD; Quadra-Trac, a permanently engaged 4WD system; and, new for 1999, was Jeeps permanently engaged Quadra-Drive, which could send 100 percent of the engines power to any wheel at any time.