where is the vehicle speed sensor VSS (output speed sensor) I need t replace it?

Replacing the output speed sensor isn't hard to do. It will require that you disconnect the battery, locate the sensor and disconnect the wiring, and then the sensor will screw out. If you look at the pics below, they provide the directions for removal and installation specific to your vehicle. Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.