Also have a Vehicle speed sensor to install

So, what I get from your answer is there are indeed all three sensors on the car? Input, output and Vehicle Speed Sensor.I am having a hard time telling what I am looking at from the diagram you sent me. What am I actually looking at, and where is this Vehicle speed sensor in relation the input and output sensors? Thanks
Nick

Sinker39, I too have a 1997 Dodge Caravan. Speedometer and odometer have stopped working and transmission is in "limp mode" (i.E, 2nd gear). I was going to replace the transmission input & output sensors, but Autozone is wanting to sell me their SU394 vehicle speed sensor (which is different from the transmission input & output sensors I am seeing for sale). So - did you determine if there really is a third sensor (this VSS, separate from the transmission input & output speed sensors) and, if so, where it is on the transmission?

Thanks, John :)

Thanks for your reply. I found out that for 1997 Grand Caravans, the 3 speed transmission has a third sensor (a three wire vehicle speed sensor, different from the transmission output sensor), but that my 4 speed transmission vehicle uses the transmission output sensor as the VSS.

I ordered some new ones, but when I went to replace the old ones, took out the air filter cover part, I saw that my output sensor was not connected. After looking a while, I found the cable lying on another rubber pipe. I connected it back up (keeping my existing sensors) and it's working (speedometer, odometer, and no longer in limp mode)!