Question about 1990 Ford F250

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Modulator possibly went bad

I think the modulator for the transmission for my 1990 ford f250 4 wheel drive is bad. How do I diagnose and replace?

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Use a Mityvac or any type of vaccum pump vaccum tester tool (avail at ay parts store) and hook it to the vacuum nipple of the vacuum modulator on the side of the trans, pump the tool to see if modualtor holds vacuum, if it doesn't it is defective.

Posted on Jun 19, 2009

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