How can one locate the vehicle speed sensor on a 93 Geo Prizm?

I am havingtrouble with my 93 Prizm 1.6 with the Auto Transmission. I belive the Speed Sensor is on the back side of the transmission. Look down from the back of your motor and look for an electrical connection to the top of your trans. Unhook the wire and its a 10mm both to get it off.