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If you are pulling a trailer you should use the D instead of the OD this will give you more power to the wheels. As for the other lower gears they would come in handy say if you lost your brakes and needed to decelerate other than that you should just put it in OD

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โˆ™ 2006-04-01 19:23:50
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Q: If you don't have to change gears in an automatic car what's the 1st 2ns 3rd D and OD uses for and at what speeds or conditions do you use them?
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