Where is the transmission drain plug located?

Hello,

The drain plug is located on the transmission pan.
Keep in mind some of these Envoys did not come equipped with a drain plug for the transmission (depending on the manufacturing plant).

If you are looking to change the fluid, it takes 5 quarts of Dexron III.
I have attached the transmission fluid change procedure below for your reference.

Let me know of any questions.
Thank you.

https://www.2carpros.com/articles/automatic-transmission-problems
https://www.2carpros.com/articles/how-to-service-an-automatic-transmission