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Your on the right track. Have you scanned the PCM, what codes did you get? If not and you changed the vehicle speed sensor,(VSS) did you check the (OSS) output shaft speed sensor, it will cause torque converter lock up and hard shifting and that pesky OD light flashing. I have also found that clutch packs inside auto tranny's dry out. Ford and some aftermarket companies sell a fluid that will recondition the clutch packs.
The problem is that either the wiring harness going to the overdrive control motor has chafed and is shorting out, or the overdrive control motor is bad. Check out the wiring harness VERY carefully, if it's OK replace the control motor.
The reason for hesitation of vehicle when accelerating is
due to lack of transmission fluid. Check your ride for any leaks and repair
them. Filling the transmission tank with fresh fluid after repairing may solve
That usually means the transmission is in "LIMP" mode... Just to get you home or to a Service Center of your choice (one that does transmissions).... When it O/D blinks the car will drive sluggish... it stays in second gear and does not shift.... just so you can LIMP somewhere...... a good price to rebuild this transmission is about 1500 dollars.... Good Luck
P0500 is the trouble code for a problem wiht the vehicle speed sensor. This is a little unit that is on the transmission.
P0760 is the trouble code for transmission shift solenoid problem, This solenoid is IN the transmission.
Take the van to a transmission specialty shop or a repair facility you trust. Speed sensor can be replaced by the user if they are familiar but the shift solenoid should be done by a professional.
OVERDRIVE ENGAGEMENT IS TIED TO THE SPEED SENSOR SIGNAL, THE SYSTEM WILL NOT GO INTO OD UNTIL THE CAR REACHES A CERTAIN SPEED, IN MOST CASES AROUND 35-40 MPH, THE SPEED SENSOR SIGNAL TELLS THE ECU WHEN THE CORRECT SPEED HAS BEEN REACHED.