Press-in vacuum modulator with bracket and O-ring, '72-'82. Vent tube in main case through early '70s. ... C6, or FMX transmission into service, you are free to use Dexron III or Mercon IV fluid.

Transmissions that use a vacuum modulator include the GM Powerglide, TH350, and TH400; and the Ford C4 and C6. These "vacuum modulator-assisted" transmissions will employ a kickdown cable (or an ...