Automatic Transmission | 1989-1993 Ram 5.9 Cummins

With the marrying of a Dodge pickup and a Cummins power plant in 1989 came rave reviews and ecstatic customers. While the 5.9 Cummins engine had already proven itself in other applications, pairing it with an automatic transmission pushed its limits—especially the 3-speed automatic in the 727 and even the 518 with overdrive. For those looking to upgrade for improved drivability and longer life expectancy, we have several options to help you harness the power of your 5.9 Cummins and get that torque to the ground where it belongs.

Upgrading your 5.9 Cummins transmission is a smart move, especially if you’re adding horsepower or towing heavy loads. The factory transmissions weren’t always up to the task of handling increased torque and power. Diesel Power Products offers high-quality transmission upgrades that improve strength, cooling, and longevity. From deep transmission pans for better fluid capacity and cooling to upgraded valve bodies and high-performance rebuild kits, we’ve got everything you need to keep your truck running strong.

Heat is one of the biggest enemies of any transmission, especially in a hardworking 5.9 Cummins. Diesel Power Products stocks a full range of transmission cooling solutions including auxiliary coolers, electric fans, and deep transmission pans. These upgrades help maintain optimal fluid temperatures and prolong the life of your transmission. Plus, we carry all the small parts and accessories you might need, like transmission filter kits, fluid lines, and hardware to ensure your entire system stays in top shape.

A quality torque converter is essential for transferring power effectively in your 5.9 Cummins automatic transmission. At Diesel Power Products, we carry performance torque converters designed to handle increased horsepower and torque without sacrificing drivability. Whether you’re looking for faster lockup, improved towing capacity, or better throttle response, we’ve got options from trusted manufacturers to match your needs. Plus, explore our selection of transmission rebuild kits, valve bodies, and related parts to complete your performance upgrade.