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Message: <blockquote data-quote="san1020" data-source="post: 16095218" data-attributes="member: 360234">If you have a vehicle with an automatic gear shift you may have noticed  there is a little button on the shift itself. Pressing that button will  turn off the vehicle's overdrive mechanism. Almost all drivers choose to  go with the automatic transmission because it is easier than a manual  transmission. There really is no other reason on earth not to get a  manual transmission since vehicles equipped with automatic transmissions  tend to be slightly more expensive. This price differential only makes  sense because an automatic transmission system must contain parts that  manual transmissions do not. It always cost more to have a machine do  things for you that you are perfectly capable of doing yourself. The  automatic transmission makes up for its higher price by allowing you to  use the hand you are not steering with for other things like drinking,  eating, talking on the cell phone, turning up the radio, or squeezing  the thigh of your significant other sitting next to you.  The  overdrive button on the automatic transmission is the only link to the  ability of the manual transmission to allow the driver to choose in  which gear he is driving. Actually, the overdrive button is kind of  bassackwards like Groundhog Day. Wouldn't you normally assume that if  the groundhog doesn't see his shadow that would be a wintry day and six  more weeks of weather? And yet it means exactly the opposite. Weird,  right? Well, when you press the overdrive button it you are actually  turning it off. Usually pressing a button in turns something on, but not  in the case of the overdrive button on your automatic transmission gear  shift.  When the overdrive button on an automatic gear shift is  not depressed, or in the on position, which it where it should be 99% of  the time, it is saving you money in gas by lowering the revolutions per  minute (RPM) of your engine. Because the transmission is essentially in  full control of deciding the optimal gear the car should be in during  any particularly everyday kind of driving condition, the overshift  button acts to save on wear and tear in the gear system, which will also  save you money. So that does mean you should never turn the overdrive  off on an automatic transmission?  Of course not, although the  average driver a car or van will rare need to do so and even very few  drivers who were suckered into buying an SUV will ever need to do so.  Turning off the overdrive button on an automatic gear shift serves to  increase the engine's torque and increases the efficiency of the vehicle  when you are either climbing a steep hill or towing something. The only  thing is that even if you have an overdrive button to disengage, you  could probably accomplish what turning it off will accomplish when  climbing a steep grade by shifting to another gear. In reality, the only  time you should ever press your overdrive button in on an automatic  vehicle is if you are towing something. An added benefit is that it will  also help alleviate the damage caused by the increase heat that  accompanies towing.<a href="http://voices.yahoo.com/what-overdrive-button-automatic-transmission-1761389.html?cat=27" target="_blank">link</a></blockquote>

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