The speed sensor is at the back of the tranny near the driveshaft, it has a screw that holds it in place, trace the wires up to the connector near the front of the tranny by the motor, a bad connector might be your problem, I had the same problem and getting a connector from the junkyard fixed it. the wires shoud be yellow/black connect to green and yellow/green connected to black. hope you get it figured out
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