Chrysler Automatic Transmission Tech!Posted in How To: Transmission Drivetrain on October 1, 2010
Automatic transmissions aren't something most enthusiasts readily repair or upgrade since most teardowns require advanced mechanical skill. However, some performance mods and upgrades for transmissions aren't as complicated as you might think.
After we put 150,000 miles on our project Grand Cherokee, its torque converter locked up, which gave us the opportunity to upgrade and install a new performance torque converter and valvebody with a shift kit. We contacted the guys at Truck Turbo & Transmission in Wheat Ridge, Colorado, and ordered a torque converter and a valvebody for the ZJ's 44RE transmission. The torque converter will provide better shifting, strength, and longevity and will hopefully help the fuel economy. The valvebody is the brains of the transmissions and will provide improved shifting performance over the factory transmission.
We had the guys at Overkill Engineering in Nuevo, California, help us with the installation. With their knowledge of transmission rebuilds and repairs, we had the torque converter and valvebody in the tranny and back in the Jeep in one day. After a few test runs with the hopped-up transmission we noticed increased power and torque performance levels in the old Grand with quick and clean shifting through the transmissions gears.