Random Lower End/Rattle/Metal Noise?? 17 TRD Sport 3.5L M6

So... posted this on Facebook to which I received no help. I have a 2017 TRD Sport w/ the 3.5L and manual trans. Here's what happens - and it's so random. As a service manager at a dealership (*non Toyota), I know what to expect and how to try to find shit wrong but here goes... there is/are...

• No patterns
• No speeds
• No temps
• No gears
• No loads

that affect this noise. The noise is, randomly, while driving a metal on metal clanking rattle type noise from somewhere in the front of the drivetrain. Engine or trans, not sure. It sounds like if I were to come to a stop without putting the truck in neutral you get that sputtery metal "Crap I'm going to stall out" noise but it happens randomly. Examples:

I hear it at 39-42 mph in 4th or 5th gear, 65-75 mph in 6th gear, while coasting with LIGHT pedal application... sometimes harder acceleration from 2-3 makes it happen. It's so infrequent that I cannot describe it to a technician or even duplicate it. Completely random. And it's pissing me off. Some days it doesn't do it. Other days it does it 6 or 7 times in 25 miles.

Anyone else experience this? I have recorded a sound file of it. The phone (LG V20) was sitting in the console on the charging pad just recording. I cut the clip down to 5 seconds, and right between 4-5 seconds you can hear it but with the tires it's noisy... so it's hard to hear it. I used Audacity to deaden the road noise a bit... hope this works. It's right at the end. Nasty little noise. Help?!?!?

Had to ZIP the WAV file... lovely.

 

Anyone?

 

Loose exhast heat shields, radiator mount, exhast hanger or pie tin skid plate?