Vacuum modulators are designed to tell your transmission what kind of load is being put on it and react with the proper line pressures and shift points. Over time, these modulators can develop leaks or get damaged, causing driving issues and even premature transmission failure. TCI solves this dilemma with these adjustable modulators. Not only do these modulators renew performance, but you will also have the ability to slightly raise/lower part throttle shift points and line pressures. Simply adjust the screw inside of the vacuum nipple for more or less diaphragm preload.

More From This Category

TCI Speedometer Gear, Drive, 10-Tooth, Royal Blue, GM Turbo-Hydromatics, Each

TCI Speedometer Gear, Drive, 10-Tooth, Royal Blue, GM Turbo-Hydromatics, Each

$52.53

TCI Kit Thrust Washers GM TH350

TCI Kit Thrust Washers GM TH350

$97.10

TCI Speedometer Gear, Driven, 38-Tooth, Blue, GM, 200C, 350C, 375B, TH425, TH400, TH475, 700R4, Each

TCI Speedometer Gear, Driven, 38-Tooth, Blue, GM, 200C, 350C, 375B, TH425, TH400, TH475, 700R4, Each

$52.53

RTS OE Speedometer Gear, Driven Gear Housing, Suit TH400, 1.935" Diam, Fits 40-45 Tooth Gears, Each

RTS OE Speedometer Gear, Driven Gear Housing, Suit TH400, 1.935" Diam, Fits 40-45 Tooth Gears, Each

$83.95