TCI Vacuum Modulator - Adjustable - GM - Powerglide - 1963-73 R01J003 Dry Sump Oil Pump

Dry Sump Oil Pump

Each kit fits Holley® 2 or 4 bbl single carb applications

but usable in any application

and both 2 and 4 wheel drive

TCI Vacuum Modulator - Adjustable - GM - Powerglide - 1963-73 R01J003 Dry Sump Oil PumpGM '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