The valve body of a transmission is often called the control valve and has been modified and updated through the years. TCI selects and uses only the valve bodies that will provide the best performance and service. All TCI valve bodies are 100% quality checked for proper function and where applicable proper operating pressures on a dedicated valve body hydraulic test machine. The TCI manual/automatic StreetFighter Valve Body is designed for the street/strip performance vehicle and is the same valve body used in the StreetFighter Transmission series. It's designed to allow fully automatic or manual shifting and is a direct replacement with no modifications required. Ideal for street/strip performance upgrades.; The competition valve body was designed for maximum performance and quick elapsed times in racing applications. By controlling the valve body only through manual means quicker shift timing and the ability to run higher line pressures than possible with an automatic shift transmission are achieved. Higher line pressure makes it more difficult for clutches to slip under high loads. TCI Full Manual Valve Bodies are an excellent choice for bracket cars monster trucks and virtually any off-road competition vehicle where a transbrake is either not legal or not desired.