check fluid level, if good, will need pro evaluation
If your transmission is not shifting into third gear and overdrive it could be a parking pawl. This prevents the transmission from rotating.
Are you sure that it's third it's not shifting into, and not fourth? The transmission is designed to not permit shifts into fourth (overdrive) until the engine and transmission have warmed up a bit.
On the Nissan 240SX the electric overdrive switch is located on the right side of the transmission. Overdrive allows shifting into the auto's fourth gear.
Yes, a faulty neutral safety switch can prevent a transmission from shifting into overdrive. The neutral safety switch ensures that the vehicle is in the correct gear for safe starting and shifting; if it's malfunctioning, it may incorrectly signal the transmission control module. This can lead to issues with shifting, including not engaging overdrive. It's advisable to have the switch inspected and replaced if necessary to resolve shifting problems.
On a 1999 Ford Expedition : Overdrive is the normally allowed position It won't shift into overdrive ( the 4th " gear " of the transmission ) until the speed is higher anyway ( such as on a highway / freeway ) If you are towing something / or driving in hilly country and the transmission is shifting back and forth between overdrive and drive , then you want to shut off the overdrive on the transmission using the switch on the end of the gear selector lever . ( the word OFF will light up near the end of the gear selector lever )
The biggest problems of why a jeep wont go into third gear is either that the shifting fork for third gear is worn or bent or the sycronizer or gear itself is worn out and needs to be replaced. Once you take the top of the transmission off where the shifter is located you can see the whole transmission gears and inspect the shifting forks. A general rule of thumb is to make sure the transmission is in second gear before taking the top off. This will make it easy to take off and rerattach the top of the transmission cover and align the shifting forks.
Is there a button to activate the overdrive on the transmission. If the button is activated and not in overdrive mode the car will never shift into 4th gear.
you have burnt out the 3rd. gear and overdrive. you will have to have it rebuilt or replaced.
If it vibrates briefly only while shifting, it's probably the transmission slipping. If all other gears are shifting ok, you're about to loose the transmission.
To disconnect the overdrive in a 2001 Pontiac Grand-Am GT with a 3400 engine, locate the overdrive button on the gear shifter. Press the button to turn off the overdrive function; this will prevent the transmission from shifting into the highest gear. If you need to disable it permanently, you may need to disconnect the overdrive solenoid in the transmission, but this requires more extensive mechanical work. Always refer to a service manual for specific instructions and safety precautions.
A gear which causes the transmission output shaft to rotate at a higher speed than the transmission input shaft.
On a 1995 Ford Explorer : Overdrive is the normally allowed position If you don't want the transmission to use overdrive ( such as when towing something , or if you are driving in hilly country where you notice the transmission is constantly shifting from overdrive to drive ) push the button on the end of your gear shift lever and the ( O/D OFF light should be lit up in your dash )