Limp Mode & No codes

I have a 96 Dodge Caravan, 3.0. I am stuck in limp mode and have no error codes, no Check Engine Light, no burnt tranny smell, no weird sounds. Car has always run well.



Governor pressure solenoid and sensors? What do you think?



Thanks

Is it just limp mode or is it a problem that mimic's limp mode?  

How about giving up some more data:  How many miles on your car? What kind of driving do you do (all highway, local delivery van in NYC etc) when was the last time the transmission fluid changed? Was it changed by a real shop or did some quick oil change place give you the old flush?  Did it start suddenly or sneak up on you?