overdrive allows the engine to run at lower RPM's , which increases the fuel economy and also the transmission runs cooler
If you are refering to the button on the side of the shifter then it is the overdrive on / off button.Toyo joe
3 PLUS OVERDRIVE
Overdrive is the normal position - if you are in hilly areas and find the transmission keeps shifting back and forth between overdrive and drive , you can use the overdrive cancel switch to shut off the overdrive feature and if you are towing something you also want to shut off the overdrive
Your 1997 Mercury Mountaineer came from the factory with ( Motorcraft MERCON automatic transmission fluid ) in your 4R70W automatic transmission ( the type that you are supposed to use should be engraved in your automatic transmission fluid dipstick just to confirm )
On my 2000 automatic 4WD, I have to drop the pan to change it. It is designed as a sealed transmission and is not supposed to need changing all that often.
yes that's how your supposed to drive it will go into o/d above 50 mph
If it's the arrow-shaped one in the dashboard of an automatic transmission Jeep, then it's supposed to indicate when you are supposed to up-shift.
A 2002 yukon automatic transmission requires dexron III. GM now offers Dexron VI transmission fluid which is supposed to be better and also backwards compatible with older dexron fluids.
If it's a manual it's supposed to whine when reverse is used, if it's an automatic it probably just needs transmission fluid.
Overdrive on is the normally allowed position , if the overdrive switch is pushed that is located on the end of the gearshift lever the word OFF is supposed to light up
Check fluid level, is the vehicle warm or cold when this happens. The torque convertor may be bad. The transmission may need to be serviced (new fluid,filter, etc).
You can overdrive their range if you go to fast but you are not supposed to