* Automatic Transmission: The speed sensor is typically located on the output shaft of the transmission, near the tail housing. It's usually a small, magnetic sensor.
* Manual Transmission: The location is similar to the automatic, but may be slightly differently oriented. It is still generally found on the transmission output shaft.
You will need to consult a repair manual specific to your 1999 Camaro's transmission type (automatic or manual) for the precise location and removal instructions. A Haynes or Chilton manual would be a good resource. Looking at diagrams in the manual will be crucial for pinpointing its exact position.