Overdrive
5 Answers
No OD is just 4th gear. I lock it out if I am towing a load in the hills or driving down a steep grade.
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What will make your transmission go bad is lack of maintenance. Change the fluid and filter every 30 - 50,000 miles or more often if the ATF is brown or light pink.
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2005 Ford Explorer should I drive with the overdrive on or off
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I never use overdrive when towing just to be safe because towing with an oversize load with overdrive will harm the vechile