Where is the Vehicle Speed Sensor and how do you replace it on a 1999 Chevy blazer?

The Vehicle Speed Sensor (VSS) on a 1999 Chevy Blazer is typically located on the transmission, near the tailshaft. To replace it, first disconnect the negative battery cable, then remove the electrical connector from the sensor. Next, unbolt the sensor from the transmission and pull it out; install the new sensor in reverse order, ensuring a tight seal and reconnecting the electrical connector. Finally, reconnect the battery and test the vehicle to ensure proper operation.