Where is the transmission drain plug located on a 1997 Pontiac Grand Prix GTP?

The transmission drain plug on a 1997 Pontiac Grand Prix GTP (with the 3.8L supercharged engine) is located on the bottom of the transmission case. However, it's not easily accessible. You'll likely need to be underneath the car on ramps or a lift for proper access.

It's a common misconception that it's at the very bottom center of the transmission. It's more likely situated towards the rear of the transmission case.

Because of the location and potential for interference from the exhaust system and other components, you should consult a repair manual specific to your 1997 Pontiac Grand Prix GTP before attempting this. The manual will have diagrams showing the exact location and any special instructions or cautions. Improperly attempting this can lead to damage or injury.