VACUUM TRANSMISSION MODULATOR 79/81 MUSTANG W/AT
Automatic Transmission Vacuum Modulator Valve for 1979-1981 Mustang.
The automatic shift of your transmission is controlled by this valve, which is operated by engine vacuum. A faulty valve can cause a transmission that shifts erratically or not at all. Fits 4, 6, and 8 cylinder models.
-Royal Purple Max ATF Transmission Fluid, #RP12320
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