For about 2 weeks now, I have noticed a weird rumble when stopping or if I rev it in park. As I rev it to 2 or 3 then near the end of it going back to idle I hear a weird rumble. I uploaded the audio to youtube so that you can hear. i put the phone right under the transmission.

https://youtube.com/shorts/ZMic6zD0Q80?feature=share

edit:2006 BMW X5 3.0i E53