overdrive light blinks on 1995 Ford Windstar

when my overdrive light blinks it the van runs when its off i have to drive on drive 2 and then shift back onto drive and i constantly have to do that

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1 answer
There is a problem with your transmission that needs to be inspected. it may be just a solenoid that enables shifting but it is best to have a good transmission shop check it out before it gets serious.