Bill shows you how to install a Threaded Vacuum Modulator Valve on your 1965-1972 Mustang with a C4 or C6 Automatic Transmission.

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If your transmission isn't shifting correctly, then you may have a faulty modulator valve. Replace it with this Vacuum Modulator Valve from CJ's for smooth shifts for miles to come!

Also known as the throttle valve, this valve controls vacuum to the transmission as you press the gas pedal it will apply higher control pressure for better quality shifts at higher RPM.

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