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That car is equipped with a 4R70W electronic automatic transmission through the 2005 model year, and the Overdrive OFF switch is on the end of the shift lever. Push it in to disable Overdrive, and again to re-enable Overdrive. This feature is typically only used when towing or in very hilly or mountainous terrain that would cause the transmission to "hunt" between Third and Fourth gear a lot.

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12y ago
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Q: How do you disable overdrive on 2001 grand marquis?
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