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There are to speed sensors in the Taurus AX4N or AX4S transmission. One is called a TSS or Turbine shaft speed sensor, located on the body of the transmission cose to the driver's side, and the other is called either a VSS, vehicle speed sensor or an OSS Output Shaft Speed sensor (both are synonomous names), and it is located on the passenger's side, down behind the engine on the top of the output shaft housing of the transmission. The PCM uses information from both sensors as well as other inputs like MLP(manual lever position) sensor, which is the PRNDL position sensor, calculated engine load(using throttle position and Mass air flow information to calculate), engine temperature, and input air temperature to make deccisions about how to shift the transmission. The Speedometer uses the signal from the VSS alone to determine and display vehicle speed. IT would seem likely that if you have a non-operational speedometer, poor transmission shift performance, and an inoperative cruise control, that the VSS is your culprit. Keep in mind though, that anything that prevents the VSS from spinning could also be your problem. THere is a VSS drive gear in the transmision, that is driven by another internal gear. Both those gears are plastic, and they do break sometimes. The probem is that the primary gear in that chain of gears cannot be replaced uness the entire transmission is disassembed. Let's hope that isn't your problem.

2006-07-18 16:34:02
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