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It sounds like the VSS has failed. If the VSS fails, it can cause the symptoms you are describing. Check the wiring and make sure your VSS is properly plugged in before you replace the VSS.

One notable exception, If your vehicle is a Generation 3 Ford Taurus SHO. The SHO uses the ABS wheel sensors to generate a signal to the computer to calculate speed. If this is the case it is recommended you take your vehicle to reputable shop for servicing, as the ABS system is a complex and important safety system for your vehicles safe operation.

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Q: What could be wrong if the speedometer stops working and the transmissions shifts hard on a Ford Taurus?
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