One problem related to overdrive light on has been reported for the 1999 Ford F-150. The most recently reported issues are listed below.
(1) 1999 Ford f150 that has been well maintained, jumps into low gear while traveling at speed limit (45-55) the overdrive light is flashing. (2)it throws you against the steering wheel. This vehicle had not given any indication of problems (3) carried to dealer (malloy Ford, jasper) on July 23 when I could take it. It has not been completed yet. The dealer said it was a heat related problem, but called back and said it would need overhauled for $3604 or replaced for $2281. 52.