Overdrive Light Blinks

I have a F150 1994 5.0L 2 Wheel Drive with Automatic Transmission.

I am getting a blinking Overdrive Light. Not sure what this could be, the blinking light comes on about 10 seconds when I pull forward. The fluild level looks good and is pinkish in color. Smells OK not burnt. Had flush about a year ago(14,000 miles ago).

Scan the computer to see if a trouble code has been set.

transman