It depends on what the problem is. From your question it is obvious you need to have it looked at by a professional.
There can be several things that will an automatic transmission not to work properly. The most common cause is a lack of transmission fluid. Broken shifting linkage can also cause the problem.
Could be a transmission problem, assuming an automatic transmission.
That indicates a problem with your automatic transmission.
The real problem is manually shifting from gear to gear with an automatic transmission. If you are referring to the automatic upshift, there may be a problem with the EGR system or vacuum system.
Most cars this is not a problem, the engines are identical.
My 1997 Dodge Avenger automatic transmission stays in 2nd gear a the time. What seams to be the problem?
parking pawl
Manual transmission: Clutch Automatic transmission: possibly low transmission fluid
There is a problem with the valve body in the automatic transmission. It may stay like that, or it may get worse - no accurate prediction can be done without pulling the transmission apart to see what the cause is.
If you have an automatic transmission then either the linkage is fouled up or you got a internal problem. That's 100 vrs about 3000 dollars.
You will need to specificate your problem, is it a manual or automatic gear box
It is an automatic transmission fluid.It is an automatic transmission fluid.