text: Engines and transmissions For 1989, the 5.9 L V8 received throttle-body fuel injection for a 20 hp (15 kW) gain. Additionally, Dodge introduced a new overdrive automatic transmission for reduced fuel consumption. This light-duty transmission was designated the A500, and was offered with the 3.9 L V6 and 5.2 L V8. An "O/D off" pushbutton switch to lock out the overdrive 4th gear was added to the message center. The A727 automatic saw continued use for some 5.2 L engines, all 5.9 L engines, and heavy-duty applications.
  The grille was redesigned for 1991 but kept the large rectangular headlamps and crossbar appearance. The engines were substantially upgraded for 1992 (3.9 L and 5.2 L) and 1993 (5.9 L) with multi-port fuel injection, new manifolds, and higher-compression cylinder heads for noticeably higher output. These newly revised engines were marketed under the "Magnum" name. A heavy-duty automatic transmission with overdrive called the A518 was offered with the 5.2 L and 5.9 L engines. As part of Chrysler's overhaul of corporate transmission nomenclature, the A500 and A518 were redesignated 42RH and 46RH, respectively, in 1992. The initial 4 signified a 4-speed transmission, the second digit identified the transmission's relative torque capacity, the letter R in the third position denoted a rear-wheel-drive transmission, and the final letter H signified hydraulic shift control. The 3-speed automatic remained available; the A727 was redesignated 36RH, and the A904, A998, and A999 became the 30RH, 31RH, and 32RH, respectively.