SOURCE: light flashing on stick shift
I had my 99 f250 do that and it was a couple of thing, I had to unplug the connector to the transmission and clean it and also it was over heating because the cooler bypass tube were the cooler houses connect to it it was getting stock. the way it works is if it is to cold outsidi, it will circulate the transmission oil just inside the transmission, when it reaches warm temperature, the tube will openup and the oil starts circulating thru the cooler.
SOURCE: O/D light flashing, hard shifting at times
Sounds like the solenoids are not working correctly in your transmission. May need to be rebuilt. Check with your local transmission shop about this problem.
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