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What is wrong with a 1987 ford F150 if it starts to shift at a very high rpm?

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βˆ™ 2011-09-15 11:53:49

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I would start by looking for worn vacum line to modulator. Or the modulator could be bad. the modulator is located on the transmission which tells the transmission to shift when the vacum pulls a diaphragm inside the modulator a certain distance. some are adjustable with a flat blade screw i believe.

2011-09-15 11:53:49
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