Chrysler Repair: Trans wont shift, 40 mph max. Is it speed sensor?, speed sensors, chrysler dealer

Question
Roland, my concorde will will not go past 40 miles hr and rpm are like at 3000. I do think its the speed sensors.  Can you tell me the location and what all should i change and expect to happen when changing the input and output speed sensor?  The car was doing well till all of a sudden it would not shift gears then check engine light came on.  

Answer
Hi Tiant,
There are nearly two dozen malfunctions that can put the trans in 2nd gear and not allow shifts. However because your speedo still works I would question whether the problem is the output speed sensor since that is necessary for the speedo also to work.
I would recommend that instead you go to a trans shop or Chrysler dealer that has a diagnostic readout box that can ask the trans controller to reveal the fault code that put it into this condition, which is known as limp-in mode. You might even get a free readout at a parts store (e.g. Autozone), but in any case a reader with the ability to ask the Trans for the code is necessary. It connects to a 16 pin socket that is under the dash, usually to the right of the steering column.  The code will begin with a P and have 4 digits. Also ask for the name of the problem, and what are the possible fixes, and how much each will cost as an estimate. Then write back and we can compare notes with the official Chrysler trans manual. I would not buy any sensors until you have the code readout, unless you want to have spare sensors around just in case. But they are around $80 each and are located on the side of the trans with the dipstick and vertical shift tower. The input sensor is near the front of the trans while the output is at the very end of the trans, both about mid-line high and similar in appearance. By the way, have you checked the level of fluid in the trans? It could cause limp-in if too low. Add only Chrysler brand trans fluid from a dealer parts counter, and do not over fill. Use a small funnel to add via the dipstick tube, but check as you go to not overfill.
Roland