overdrive on or off? - Ford Mustang Forum
 
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post #1 of 7 (permalink) Old 05-15-2006 Thread Starter
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overdrive on or off?

ive always kinda wondered this....what exactly does the o/d button on my auto shifter do? i know it turns my o/d on and off but what does that mean? is the car necessarily faster with one or the other? which one should i have when im just cruising and which should i have when i want some speed or accelaration? this might be a stupid question...but i dont know that much!

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post #2 of 7 (permalink) Old 05-15-2006
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Not a stupid question.

Your transmission is a 4 speed, the 4th gear is called overdrive, so you have R-1-2-3-OD

A transmission in which the highest gear ratio is less than a one-to-one ratio. This means the drive shaft turns faster than the engine crankshaft. The overdrive feature saves fuel and, because the engine runs slower, engine wear and noise are reduced.

On stop and go traffic at low speed (under 50mph) it is better to have OD OFF (to reduce shifts and internal clutch and overdrive band wear)

If you cruise at a constant speed leave OD ON


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post #3 of 7 (permalink) Old 05-16-2006 Thread Starter
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thanks...that answers a lot. so is one necessarily faster than the other like from a stop or from a roll?
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post #4 of 7 (permalink) Old 05-17-2006
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From a stop or roll, it will make no difference on or off, it just allows the transmission to shift into 4th (overdrive). If overdrive is off the transmission will only use the first 3 gears.

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post #5 of 7 (permalink) Old 05-17-2006
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Is it typical in dragging the auto that you would want to lock out the 4th gear? More pull keeping it in 3rd or would that hurt the engine?

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post #6 of 7 (permalink) Old 05-17-2006
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Quote:
Originally Posted by GreenStang511
Is it typical in dragging the auto that you would want to lock out the 4th gear? More pull keeping it in 3rd or would that hurt the engine?
no, it won't hurt the engine at low speeds. forcing it to scream would affect the life of the engine . ..

Gas mileage may suffer, as well . . .

Woe to him who builds his palace by unrighteousness,his upper rooms by injustice,making his countrymen work for nothing...Does it make you a king to have more and more cedar?Did not your father have food and drink?He did what was right and just,so all went well with him. He defended the cause of the poor and needy,and so all went well...But your eyes and your heart are set only on dishonest gain,on shedding innocent blood and on oppression and extortion. Jer 22:13, 15-17
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post #7 of 7 (permalink) Old 05-21-2006
 
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i pretty much never touch that button.
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