Speed Sensor

it is located on the back side close to the pasangers on the trans housing two wire plug one 10mm bolt holds it on. remove plug loosen bolt and pull old one out and go reverse on new one if you follow the axel shaft on the passanger side to the trans you should see the speed sensor. speedo not working or trans shifting funny?(NOS)

1997 Taurus, 200K mi. I had the classic problem indicating a speed sensor failure. Speedo didn't work and transmission shifted hard or stuck in low gear when heated up. There are two sensors on the transmission, the Vehicle Speed Sensor(VSS) located on the output shaft of the transaxle on the passenger side, and the Turbine Shaft Sensor(TSS) located under the exhaust manifold on the input shaft, accessible from the driver's side. I thought the VSS was bad but couldn't find it and ended up changing the TSS. This fixed my problem so my question is, which one of these sensors drives the speedometer? Both, VSS, or TSS? Most posts on this issue say to change the VSS when this problem occurs and make a vague reference to the TSS.

Any applicable trouble codes? My wiring info does show direct connection from vss to speedometer. The signal from TSS goes to computer. I can't say one doesn't effect the other?

Hope you got it fixed by now? Better never than late? have a good day.