Question about Ford F-150

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I have a 1977 ford f150 4wd with a c4 automatic transmission. it will not upshift unless you let off the gas pedal and then it will upshift? does the c4 tranny use vacuum to shift up or what could the problem be?

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Replace the modulator on the transmission.

Posted on Mar 22, 2013

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Check vacuum line to modulator valve

Posted on Mar 17, 2011

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