Ford Expedition goes up to 20 mph. Then engine revs faster and rpm jumps, but car won't go faster. I turn Overdrive off, and the issue is gone. What's wrong?

Asked by Nov 15, 2016 at 08:50 PM about the 2006 Ford Expedition XLT 4WD

Question type: Maintenance & Repair

9 Answers

74,505

Check the transmission fluid level but things don't look good for your transmission. If you need a new one I highly recommend buying a Ford factory rebuilt one.

5,385

You don't say how many miles are on the Expo. Sounds like OD is slipping. As above, might be just fluid low if your lucky.

It has 190k. The transmission was rebuilt about 100k miles ago.

The transmission fluid seems fine.

5,385

From what you have said, I believe your OD is slap worn out and needs to be replaced.

Thanks. Do you think If I drive it with overdrive off, Is there a risk the whole transmission goes?

5,385

Drive it? Maybe to the repair shop if it's not too far.

5,385

The OD is an integral part of the transmission. If you drive it and it lets go, it will take the whole transmission with it.

15

OD off means that you are now only using 123 gears. Your tranny should be a 4speed and shift to a higher gear with OD off !

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