I have a 2007 Range Rover HSE 4.4 Jag Motor with 127,000 miles on the odo and located in Greensboro NC. For the past few months I have had a odd gurgle sound around 1200 to 1700 RPM. I have attached a clip of the dash to see RPM and sound along with speed etc. 28 second mark is where it begins to make the noise and continues anytime i get near that rpm

I have replaced the Wheel Bearings, CV Axels, Wheel Hubs previously but this only makes the sound when I press the accelerator. When the window is down it actual makes a slight metallic sound at that same RPM. when the windows are up the sound is what you hear in the video.

Thoughts suggestions of things to check etc would be greatly appreciated. I work on my own vehicle so easy for me to try out various recommendations for the most part.

Thank you all for the help in advance!