Hi Kenworth. The OD light is trying to tell you something and it could be innocuous or not. Your Ford dealer will be able to read the diagnostic code and you should get it to them quickly to prevent any further damage especially if you transmission fluid level isn't what it should be. Good luck!

Advanced Auto Parts ,if you have one near you can run a diagnostics for free. In return buy your parts from them,they have warranties and a refund policy!Most will even have loaner tools so you can change the parts right there in the parking lot!

your od drive switch is probley going bad if trans shifts right in all gears no problems,just replace switch,not a hard job 10 minutes at most.most are on side of trans.