Okay first if the O/D light is flashing then you have a transmission malfunction code or codes
stored in the PCM.
Now you need a diagnostic scan tool to check for malfunction codes ,from the codes this will put you on the right direction to where the problem is .
Now if you have a malfunction code P0720 which is a typical code on this vehicle .
So for your research here is an example .
P0720 is a OUTPUT SPEED SENSOR ERROR. this does not mean that you have to replace this part but to test it first as
you may have a wiring / connection problem or even a bad PCM .
POSSIBLE CAUSES :
INTERMITTENT WIRING & CONNECTORS CONDITIONS
REPLACE OUTPUT SPEED SENSOR
OUTPUT SPEED SENSOR SIGNAL CIRCUIT OPEN
SPEED SENSOR GROUND CIRCUIT OPEN
OUTPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO GROUND
OUTPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE
SPEED SENSOR GROUND CIRCUIT SHORT TO VOLTAGE
So as you can see checking for codes is very important ,
Not a good idea to start replacing parts on assumption, or from some forum that said he had the same problem replace all the solenoids ?? when the problem could be justy a cheap speed sensor or a bad wiring connection or plug..
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Kind regards Greg