Chrysler Repair: trans problems/speedo problem/wont stay in gear: Sebring, sebring lxi, electrical plug

Question
If you can answer this you are a god among men. My sebring lxi has a speedo that is way off. Ill cruz doing about 50-55 and it will say that in doing 100mph. and when i cruz to about 125mph on my speedo the car drops into neutral. Everyone has been telling me different things, "sensor this, Ecm that and a host of other things. please help me. i am stuck in Ga and cant go home due to this problem..jaimurda@yahoo.com cell912-308-0392 call anytime after 9..please help

Answer
Hi Jermaine,
The quickest way to deal with this is to get a readout of the fault codes in the engine and transmission memories. You might be able to have that done for free at Autozone store. Then get the numbers of the codes, the titles, what they mean, what they say is the fix and how much $. A readout at a shop might cost $40.
Other than that, the main suspect part you might try to substitute is the transmission's "output speed sensor". It is the device that provides the signal to the speedometer and also the transmission requires that signal to be accurate to run properly. So if it is something simple, this would be it. I believe it costs in the range of $75, and it can be put in within a matter of minutes. It is located on the side of the trans that faces the front of the car, basically it is at the very far right end of the drivetrain (the driver's end in other words as you face the car) and it has an electrical plug-in that is held in place by a tab (lift tab carefully so not to break it off),pull the plug, and then you simply unscrew the old one (counterclockwise) and screw in the new one (clockwise) tightening it to a torque of 20 foot-pounds with a wrench that would fit it "flats" on the body of the sensor. So once you can find such an output sensor, and have/buy a wrench that fits it, you could do it yourself if needed. If the wrench is 9" long then pull on it about as hard as if you were lifting about 25 pounds; or if you ever replaced a spark plug that is the torque for a spark plug install. Don't overdue, it would be better to have it a bit loose than to strip the threads. You will be able to see it once you know what it looks like. It is to the right of the trans fluid dipstick tube, and there is another one just like it to the left of that tube, so don't confuse them.
If you get the codes, let me know the numbers, names, what they say needs to be done. I can then compare that with what the manual says about that code.
Don't panic, just try these 2 approaches and maybe it will work out fine. I'll let you decide whether to get the code readout or just go for the sensor and see it that fixes it.
Roland
PS: I will be up at around 5:30 AM PST and available to respond until around 10:30AM PST (three hous behind you).