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What is the function of overdrive in automatic transmission car?
Wiki User
∙ 9y ago
An overdrive transmission allows for less engine speed and thus greater engine economy. When in overdrive the transmission has a gear drive of less than then the engines speed. In the General Motors 4L60E Hydramatic transmission for example, in overdrive gear (4th) the transmission has a ratio of . 70. This means for each 1 rotation of the crankshaft, the output shaft of the transmission rotates . 7.
Wiki User
∙ 9y ago
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When should you engage an overdrive gear on an auto car?
Overdrive is the normally allowed position in a Ford Explorer automatic transmission , once the vehicle speed is fast enough ( my Ford Explorer is 50 MPH ) the automatic transmission will automatically shift into overdrive
When do you use overdrive in an automatic car?
If an automatic car is in off overdrive does it save fuel
How many gears does a automatic transmission car have?
Three. Or (with overdrive) four. Plus reverse, of course!
What is overdrive for in your car?
Overdrive is almost like another gear for your transmission. Say you have a four-speed w/ overdrive automatic transmission in your car. Once you get up into fourth gear, and if you're not trying to accelerate hard, the trans will kick into overdrive. It drops the engine's RPM's and saves gas. When you are traveling on the highway it help to conserve fuel.
What could be the reason my 1986 Toyota Camry with automatic transmission with overdrive will not shift into overdrive?
I was told that it is the temp sensor. The car needs to be at 150 degrees. I am working on the same problem.
What if your car loses RPMs at 45 mph?
If your vehicle has an automatic transmission with overdrive, then at speeds above 45 mph, it should be in overdrive, which reduces engine RPM's to save fuel.
On a 1994 Mazda 626 How do get the button on the shifter to switch back over to automatic from overdrive it is stuck in overdrive and when you push the button it won't switch back?
The button does not switch from Overdrive to Automatic. The button just turns the overdrive off. Overdrive is not a separate drive system as your question implies. Normally you leave the car in overdrive mode. That way the transmission shifts into overdrive at highway speeds, thus saving fuel. If you are saying the transmission is stuck in overdrive and it will not disengage then seek out a A/T professional.
What is an automatic car?
A car with an automatic transmission.
What happens to a car when overdrive goes out?
If the rest of the Transmission continues to function, then result is that the engine RPM's will be higher when cruising than is normal. Overdrive reduces the RPM's at the speed where it engages.
Where is the overdrive on a Subaru Outback?
Overdrive in Subarus, like just about every car with an automatic transmission built in recent memory, is built into the routine working of the transmission. Your transmission selector, if it's like mine, has a "D" for drive then the next digit down is a "3". Choosing the "D" allows the vehicle to access overdrive when appropriate. Driving with "3" as your chioce does not allow the overdrive to work. --Ken
What is the overdrive for on a 1993 Lincoln town car?
Overdrive is the normally allowed position on your 1993 Lincoln Town Car . It is the " fourth gear " of your automatic transmission that allows the engine to run at a lower RPM when you are on the highway / freeway You get better gas mileage and the transmission will run cooler , so it's a good thing
How can you tell if your car has overdrive?
The top gear on the transmission will be marked 'OD' usually. If you have more than a three speed automatic or four speed manual transmission, it's a pretty safe assumption that you do.
