It probably is a failing transmission, which is likely since its a Dodge and its getting old. Signs of failure include jerking when reversing and when passing through gears. I dont know how long it would hold out for. It probably would not benefit you to switch out the transmission fluid, since...
I currently drive a 2000 Toyota Corolla. I am thinking of getting a 2010 Corolla. Please rate it on the following and explain if possible:
Power
Reliability
Steering
Comfort
Rate on a scale from 1 to 10.