I do not see anything loose. One other piece of info. There are times when i am making a turn and the trans lags in second gear before i accelerate and it can get louder at that time.

 

Sounds like exhaust...

 

I've almost always had success with 4 jack stands a mechanics stethoscope and a tow strap. Get that sucker off the ground try to duplicate the sound with the vehicle in motion. Slowly albeit. Have someone assist you by moving the steering wheel and increasing speed in small increments. Listen inside the vehicle at first then move outside of it. Use the towstrap as a safety and don't wear loose clothing around moving parts. Wheels, driveshafts etc. I've worked at auto shops and this is how we figure out those hard to diagnose NVH sounds.