TH400 TH350 Transmission Modulator Black Red for Low Vacuum Adjustable + Hose
TH400 / 3L80. This vacuum modulator is ideal for both diesel & low vacuum gasoline engines. 1964-1992 GM Adjustable Vacuum Modulator with Large Diaphragm. Modulator to case O-ring. Rostra has updated the modulator now with the words “BLK / RED”, replacing the painted on stripes.