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It is not recommended to pull a trailer with automatic trans in overdrive, put in drive only. When attempting to pull without locking out overdrive, trans will continue to shift from drive to 0verdrive causing a massive heat buildup. Heat is not good for automatic transmissions, and will eventually cause failure, causing your wallet a very bad day!

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Q: What keeps the transmission from going into overdrive when pulling a trailer?
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Why is overdrive before drive in a 1992 buick lesabre?

The overdrive is before the drive because as you ordinarly drive down the road your car automaticaly goes into overdive when you reach a certain speed. You use drive only when you are pulling a trailer or going up a large hill so it won't go into overdrive and put undo work on the transmission or motor. It is also a gas saving factor.


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The overdrive should be switched off when you want to avoid unneccessary shifting. If you are driving on a hilly road, the vehicle will shift out of overdrive going uphill to maintain speed while pulling the vehicles weight up the hill, and shift into overdrive going down the hill to save fuel when additional engine power is not needed. When towing with an automatic transmission, the vehicle may tend to repeatedly shift in and out of overdrive due to the added weight. In scenerios such as these, you should turn off the overdrive to avoid the unneccesary shifting which puts more wear and tear on the transmission.


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