TCI Vacuum Modulator - Adjustable - GM - Powerglide - 1963-73 R01J003 Blue / Red / White

Blue / Red / White Chevy Bowtie Logo

Best in class performance - Weighs just 4 pounds

-8 AN Inlet

and both 2 and 4 wheel drive

TCI Vacuum Modulator - Adjustable - GM - Powerglide - 1963-73 R01J003 Blue / Red / WhiteGM '63 '73 Powerglide Adjustable Vacuum Modulator Valve. This TCI Adjustable Modulator Valve is designed specifically for GM '63 '73 Powerglide Transmissions. 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