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That will turn off ( or turn back on ) the overdrive feature of your transmission

When the overdrive is off , so the transmission only uses the first ( 3 ) gears

the O/D OFF light will light up in your tachometer . Overdrive is the normally

allowed position so if you shut the vehicle off , the next time it is started the

overdrive feature is allowed or if you have shut the overdrive feature off just

push the button again to turn the overdrive back on

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Q: What is that button on your shifter knob in your 1999 mercury cougar v6?
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