These revolutionary constant pressure valve bodies from TCI solve the low line pressure (above 200 psi) problems associated with improper shift T.V. cable adjustment. Automatic transmissions are complex components--mysterious boxes filled with fluid and strange-looking parts that challenge even an accomplished engine builder. Many racers and street performance enthusiasts incorrectly install their transmissions, with the critical T.V. cable used to set internal line pressure, and the part throttle shifting either left disconnected or improperly adjusted. The result is a total transmission meltdown, often within a matter of a few miles. These TCI constant pressure valve bodies solve that problem. In the past, T.V. cable adjustment on transmissions required near-expert mechanical abilities. Installing these TCI constant pressure valve bodies helps you to avoid common transmission destruction by maintaining at least 200 psi of line pressure at all times. While the T.V. cable still needs to be connected for proper transmission operation, the TCI constant pressure valves provide more freedom when setting part-throttle shift points. Line pressure is fixed with no chance of encountering a low line pressure condition. These valve bodies are designed for street and mild race applications, plus they include detailed instructions for a proper installation.