The 700R4 transmission can be used in street rods, show cars, towing vehicles etc. Gm used this transmission in S10's, Caprices, full size 4X4 trucks, Camaros and more. GM has a different shift feel and torque capacity for almost every type vehicle made. This is done by using a multitude of different valves, servos and springs. It's no surprise some shift improvers don't work. We have researched this transmission to find out what valves, servos and springs give the most torque capacity. These parts along with the rest of our kit will provide firm shifts at low speeds and hard car launching shifts when you step hard into the throttle. This is our High Performance 700R4 improver. (Pro Shift Improver part #PRO785PN) If you are using a 700R4 transmission in a vehicle that does not have a computer you will need some type of switch to turn the TCC solenoid on and off. Our converter clutch control switch (part #PRO458) is designed to automatically turn the TCC solenoid on in 4th gear. Unlike most TCC switches that are installed on the outside of the transmission ours is installed on the inside to avoide transmission leaks. Our switch comes complete with an intallation sheet.