Chrysler Repair: 2000 T & C Transmission doesnt shift/speedo doesnt work, input output connectors, speed shaft

Question
My 2000 T & C FWD A/T no longer upshifts when on Drive. It seems like it's stuck on one gear. Also the speedometer stopped working. Took it to AAMCO and they told me I need to replace the Solenoid Block, the Input and Output sensors/connectors and the Pigtail sensor/connector. Are these diagnosis correct? Are these parts easy to replace? Where are they located? I could not find a repair manual that points out exactly where they are. And also when I looked up the parts on auto parts stores they have been called slightly different from what the AAMCO techs call them. Solenoid block (Trans Control Solenoid?), Input/Output  connectors (Speed sensors?) and Pigtail connector ( What is this?). I just want to make sure I get the correct parts if I decide to replace them myself. Thanks in advance.

Answer
Hi Al,
The failure to shift is called "limp-in mode" and is due to the failure of the output shaft speed sensor, no doubt. I am not sure about the input sensor without doing a code readout, but I doubt that one as well as the "pigtail" problem unless you check the plug that connects to the sensor yourself which is probably what they meant by that term. I would not replace a 'pigtail' unless it clearly was poorly connecting to the sensor because that involves splicing into the harness which has its own risks.
The output and input sensors are on the side of the trans that faces the front of the van, at the midline level. The input sensor is at the front of the trans and the output at the very rear of the trans. They look very similar. The wire color for the output speed (shaft) sensor is light green/white and dark blue/black. It simply unscrews from the trans case. I would replace that one which should restore both the speedometer function and the trans to shifting properly. If not, then maybe consider the input shaft (turbine) sensor for replacement but I doubt they would fail simultaneously. I suspect a bit of featherbedding at the AAMCO shop on that score. If it has failed there would be a fault code stored in the trans memory which should appear on a DRB III readout, but maybe you won't have to go that far, if replacing the speed sensor does the job.
Let me know if you have further questions.
Roland