text: Transmissions Ram transmissions are labeled such that the first number indicates the number of gears (including overdrive), the second number is the capacity rating, and the last letter is either E for electronic or H for hydraulic.
  A500/42RH-RE lower geared light-duty applications found behind the 3.9 L V6. The 42RE + RH are both 4-speed automatic transmissions with identical gear ratios. This transmission came available in 1989 and it is paired with a 10.75-inch diameter torque converter. The RH is a hydraulic governor system that is rated as a medium-duty transmission. The RE is an electronic hydraulic system that is considered for heavy-duty use. Both transmissions are also used in the Dodge Dakota and Jeep Cherokee among other Chrysler models. Gear ratios in both transmissions are 2.74:1 for first gear, 1.54:1 for second gear, 1.00:1 for third gear, and 0.69:1 for fourth gear.
  A518/46RH-RE for more heavy-duty applications found behind the 5.2 L and 5.9 L V8 engines. The 46RH and RE are 4-speed automatics that were born from the A518 family. The A727 was replaced by the A518 family in the early 1990s. The 46RH was the first to replace the A727 and was preceded by the 46RE. The improvement with both models included the overdrive being added. The difference in the two transmissions was the RH had a hydraulically controlled governor versus the computer-controlled one on the RE.