Question about 1994 Cadillac DeVille

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The transaxel was rebuilt - now the speedometer jumps around at about 60 mph in overdirve and the cruise control cuts in and out. When in drive the speedometer jumps round at about 40-45 mph. The transaxel wines between shifts, after shifting into drive or overdrive it quiets down. at 40 to 45 mph the car jerks around - seems to be shifting in and out of overdrive?

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  • david_kvalst Sep 11, 2009

    Thanks ginko,

    I will return it to the garage with your remarks and see if they correct the problem and let you know. I suspected the same but wanted some concurance before I took it back to them. Dave



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After replacing the transaxle, the Transaxle Input Speed Sensor is damaged or it had been mounted incorrectly. The problem can also be a Vacuum problem.

Testing vacuum it is easy. this is tested using a pressure gauge in vacuum lines, and pulling OBD codes.

Service codes may also confirm that there is a problem with speed sensor.

Being the speed gauge affected , the problem is almost for sure speed sensor.

On a Deville Transaxle Input Speed Sensor is located inside the on the transaxle.

The sensor can be accessed removing the transmission side cover.
Fixing the sensor may be quite a complicate job.
If you have replaced transaxle at a garage have it fixed by the mechanic, as the original repair had not been done the way it should be.

Here all doagrams for your car.

Posted on Sep 11, 2009

  • Ginko
    Ginko Sep 11, 2009

    Hi David,

    I think going back to the mechanic will be the best choice. Replacing the transaxle is not a simple repair (and not cheap), a lot of work is involved, and if you get this kind of problem after replacement, then something must have gone wrong. In your case it is almost surely the speed sensor.

    Thanks for keeping us updated.




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