I had this same problem. I took the car back several times to the dealership. They claimed that they couldn't duplicate the condition. On the 3rd time, the car was past warranty, and they did find that it was slipping into neutral. I showed that my history of returning the car during the warranty period, and they agreed to replace the entire transmission. I of course had to pay for new fluids, but it was worth it.
the top gear, which will include overdrive. It will be the first selection after neutral.
The " D " with a circle around it ( next to the neutral " N " position ) is the overdrive position . That is the normal position when driving the vehicle , it allows the transmission to shift into the fourth gear ( an overdrive gear ) when you are crusing at a higher speed . When it shifts into overdrive your engine won't rev as high , your gas mileage will be better etcetera
I have a 1997 ford e 350 van with automatic transmission when the transmission shifts form 3rd gear to overdrive at about 50-55 mph it falters and bucks and I have to let off on the gas so it can pick-up speed, when I have overdrive off and put on overdrive when 3rd gear shifts to overdrive at 50-55 mph it shifts smoother but if I give too much gas again it bucks and falters till I let off gas so it can retain speed slowly.
Park for automatic transmissions, and Neutral for stick shifts.
First of all...auto or manual? Also, why was the question asked as if overdrive is it's own gear? Check your fuses first, but with lack of detail there is no definite answer at this time.
Overdrive is the normally allowed position , but unless you are going fast enough it will not shift into overdrive because it acts as the " top " gear ( on my Explorer I have to be going 50 miles per hour / 80 kilometers per hour before it shifts into overdrive )
The neutral position is usually between first gear and second gear. Put the bike in first gear then push up that should put it in neutral.
The overdrive. Try driving it with the overdrive off.
It's not shifting into neutral, the 3rd gear "drive" band is slipping. Time for rebuild.
Top Gear Overdrive happened in 1998.
If a 1988 Mercury Grand Marquis shifting out of second gear gets choppy after acceleration then the overdrive band may need servicing. An overdrive band that is sticking can also cause this problem.
If this is an automatic transmission, which I am assuming it is it will not work the same as a standard. Only drive it in overdrive or 1st gear.