trans wont shift into 3rd changed out put speed sensor and input speed sensor also fluid and filter

 

If your car is stuck in 2nd, then your motor is in "limp mode". A couple more culprits are...ATX relay (see FAQ), TCU, the tranny, etc.. When you had your fluid changed, was there mention of any metal flakes? Did you have MOPAR ATF +3 put in or did you have an equivelant put in? MOPAR fluid is best for these picky trannys btw.

One more thing, we need more info. I'm pretty sure there's more to it than just the tranny being in limp mode...like....how did it get there? How long has it been doing this? Cold motor, warm motor, or all the time? After driving for awhile or all the time?...etc.

 

The transmission may have a broken hub with shaft, If you have 1st and 2nd gear and 3rd is not there, the shaft has broken inside the trans.

 

I SECOND limp mode ... Jumping to a broken hub is pretty severe without all the facts ...

Here's a site with good info on the A604 tranny ....
http://www.allpar.com/fix/trans.html

 

the car came from a dealer auction changed fluid no metal some times if you let off petel it wiil shift also its always tring to find its idle chaned isc and air idle valve also took plenum off and replaced gas to make sure no vacum leaks also if i buy a new trans control from my work do i have to take it to dodge or can i program it with my acctron scaner also it passes on key on engine off

 

where is the atx relay and how hard is it to install the trans selenoid pack once you drop the pan

 

https://dodgeforum.com/m_554757/tm.htm

 

The atx relay is on the firewall above the master cylinder, there will be two may three relays. one is for the trans and the other is for the back-up lites.