TCI Vacuum Modulator - Adjustable - GM - Powerglide - 1963-73 H760C01XXL and 80-85 Impalas

and 80-85 Impalas

These adjustments are possible due to an advanced digitally-controlled ignition module

Differential Housing Mount Bushing Insert

but our guide tool can also be used during disassembly

On race day there's some force that pushes you to go faster

TCI Vacuum Modulator - Adjustable - GM - Powerglide - 1963-73 H760C01XXL and 80-85 ImpalasGM '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