Transmission makes a loud gurgling sound?

Can you please shoot a quick video with your phone so I can hear the noise? That way I can tell for sure what's going on. You can upload it here with your response. It could be low on fluid so that is what I would check first, here is a guide to help you:

https://www.2carpros.com/articles/how-to-check-and-add-transmission-fluid

This guide may help as well:

https://www.2carpros.com/articles/automatic-transmission-problems

Please go over this guide and report back.