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1997 Ford Taurus. I had the classic problem indicating a intermittent failure in the VSS sensor. The speedometer didn't work and and transmission didn't shift correctly or sometimes remained in low gear when the car got hot. I looked around on the passenger side output shaft and couldn't find the sensor. I then moved to the drivers side and looked in under the exhaust manifold and there was a sensor way back in there. To verify this sensor was bad, I disconnected the wiring while the engine was cold and everything was working. The speedometer and transmission stopped working. I installed a new sensor and the speedometer and transmission worked again. My question is, did I change the VSS(Vehicle Speed Sensor) or the TSS(Transmission Shaft Speed)? Can either of these cause the same problem? I sort of vaguely remember when I had this same problem 100K miles ago with this same car, the mechanic had a ratchet stuck down on the passenger's side of the engine compartment where most articles say the VSS is located.

I replace the speed sensor in my 1997 Taurus back in 2011. The details are a little fuzzy, but I have attached an article I wrote that has pictures and details. I have uploaded the article in. PDF format so you should be able to open and view it. I have additional pictures if that would be helpful.