The vacuum modulator is a vital component of automatic transmissions. It tells the transmission what kind of load is being put on it, allowing the transmission to react with the proper line pressures and shift points. Over time, modulators can develop leaks, suffer ruptured diaphragms, become bent, etc. This can not only cause annoying drivability issues, but it can lead to premature transmission failure. TCI® comes to the rescue with a full line of new, adjustable modulators.

• Fights premature transmission failure & renews performance
• Allows ability to slightly raise/lower part throttle shift points & line pressures
• Screws inside the vacuum nipple can be adjusted for more or less diaphragm preload