My overdrive on/off switch started blinking. Any ideas what would cause this?
I'm taking to dealer this week.

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98 flareside 4.6, offroad package, auto, electric shift

 

A blinking overdrive light means the computer has found a problem with the transmission. It could be any of about 50 different things.

Mark

 

Mine does it when exposed to alot of rain, when it stops raining the light stays off.

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97 XLT Flareside 4X4 SC
Black w/Graphite
ORP/FQR 5.4@26k /3.55 LS
Towing Package
Flowmaster Duals
Superchip
Poweraid
K&N Filter
Bridgestone Dueler AT's
Century Topper
Rhino Liner
Catchall Mats
Corbeau RS Seats
Wilson 1000 Mag Mount
Uniden 510XL
Astatic 575
Clarion DRX6575z
Prestige APS-600
Lund Solar Visor
Lund Screen Fronts
Tinted Windows

 

Mine started blinking over the holiday weekend in my expy and then started to slam into gear. That Wednesday they were putting in a new trany. Only had 47K. My F-150 has 85K and is running fine so far. I have read about the weak tranys in these trucks but anything can happen, it's a machine. Good luck!