Roger, that doesn't even make a whole lot of sense to me. If the overdrive is causing the transmission to slip, wouldn't it also cause the fuel mileage to go down? Are you sure the transmission is slipping? Or is the transmission simply shifting in and out of overdrive? If it is, is it shifting at the proper speeds? Driving at around 40 - 50 Mph will sometimes make the transmission go in and out of overdrive repeatedly. This can be perfectly normal.
Have you checked your transmission fluid level?
Is your overdrive off light flashing? If the transmission is actually slipping the OD OFF light should be blinking at you to let you know there is a transmission problem. Either that, or the Check Engine light will be coming on. In either of these cases, you need to scan your onboard computer network for possible fault codes.
SOURCE: 1989 lincoln mark vll automatic transmission
you may have damaged the overdrive gear, a local transmission shop would be your best bet. for good troubleshoting and estimate.
SOURCE: when i put car into drive overdrive, the
Find a good repair shop and have them test your transmission for codes. If your car shifts ok normally possibily your override solenoid might be going out.
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I am having the same issues with my 2000 town car, I can accelerate until I let off the fuel pedal then it slips, , then I have to put it into 2 gear then slap it back into Drive
there are no indicator lights that there are any issues going on with the car at all.
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