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1999 ford ranger od/off light flashing regular after going into overdrive lock up.it matters not whether the switch is in the off or on . what is crazy is that you drive it for 5 minutes before the light starts flashing.

Vehicle: 1999 Ford Ranger 2.5L

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is the transmission slipping? 
 
when was the last time the transmission fluid was replaced. it suppose to be replaced every 30k miles I would drain and refill the fluid, if that does not help the torque converter clutch might be bad if there is no wiring issue.
 
Possible causes
- Faulty torque converter clutch solenoid valve
- Torque converter clutch solenoid valve harness is open or shorted
- Torque converter clutch solenoid valve circuit poor electrical connection
- Low transmission fluid level
- Dirty transmission fluid

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