the transmission is in overdrive I don't have overdrive in my car but look at your gearshift because the small button on it should be how you disengage the system
Yes, under most conditions you can use overdrive. If you are pulling a heavy trailer, or the vehicle is heavily loaded, I would recommend you don't. If at anytime you a driving loaded and the transmission starts changing gears constantly, you should disengage the overdrive.
When your transmission starts down shifting a lot. Or in other words keeps jumping out of overdrive often. Remember all your transmission wear happens only when it changes gears.
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.
is this a manual box with the button on the top of the stick to get 5 st overdrive gear drive in forth up to 40 mph then press the button overdrive light green light now on press to come out of overdrive or change down a gear to third.
If you are city driving, and stopping at many lights. The tranny might be shifting into overdrive constantly for just a few seconds before you have to stop again, which would cause excessive wear on an expensive transmission. Personally, in this situation I would disengage the overdrive.
You can leave it engaged all the time if you wish - it will shift into, and out of, overdrive mode when necessary. HOWEVER, if you do a LOT of driving in the 35 - 45 MPH speed range - to prevent the overdrive from "hunting" back and forth, you can disengage it in that kind of traffic.
This is a built in feature to protect you from burning up the transmission. The computer will automatically disengage overdrive when the transmission fluid temperature sensor gets critically high, for instance, when you are trying to tow in overdrive particularly at high speed. This happened to me in fact hauling a boat several hundred miles on an interstate. I thought the truck should be more than capable of towing it in overdrive but I was later corrected by my dealership. As a rule, if you have something attached to the hitch, turn off overdrive.
OD= Overdrive. There will be a switch to engage/disengage the OD located on the shifter, or on the console in close proximity to the shift lever. It should even have a marking on it.
For most drivers, Overdrive should be used full time. Its designed to reduce the amount of effort the engine needs to maintain speed. Whenever a lot of shifting is taking place, its recommended to only used Drive. Roads with a lot of hills, curves, or heavy traffic areas should not use overdrive to prevent damage to the transmission. Also, disengage overdrive whenever towing. There is not enough torque generated by the engine to tow while in overdrive. Towing while overdrive is engaged can cause damage to the engine and transmission.
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