The transmissions used in Dodge and RAM pickup trucks are commonly heavy-duty units reinforced to transmit large amounts of power, especially in 2500 and 3500 trucks fitted with high-torque diesel engines. Many of the transmissions used with high-torque Dodge and RAM engines are automatic transmissions rather than manual units due to the stronger construction of automatic transmissions of this type.
Dodge trucks and their successor RAM trucks have used six-speed automatic transmissions built by Japanese company Aisin Seiki since 2007 on the most powerful models, including the 2016 RAM 3500 Dually that can tow in excess of 31,000 pounds. These transmissions are designed for use in commercial trucks and buses and have fewer moving parts than some four-speed transmissions, improving their reliability. A large 14.79-quart transmission fluid capacity and 1.68-inch output shaft also improve the ability of these transmissions to transmit the torque of Dodge and Ram diesel engines of up to 900 foot-pounds in the RAM 3500.
Dodge and RAM trucks using a conventional gasoline engine usually have either a Getrag-sourced manual transmission or an automatic transmission built by Chrysler known as the 68RFE. Both the manual and automatic transmissions usually feature six gears. Chrysler began offering a lighter-duty transmission known as the 66RFE in 2012 that is largely similar to the 68RFE except for its torque converter.