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2013 F350, CCLB, 45k miles, deleted with 4" delete pipe, Tyrant engine and trans tunes. Truck is not abused, and does not do any heavy towing.

Truck has developed over the last few thousand miles a very obvious drivetrain audible drone, particularly in 3rd and 4th gears. It is starts around 1200rpm, and fades out but doesn't completely diminish, above 1400 rpm. If torque converter is unlocked, it's barely noticable, but as soon as the converter locks, the drone almost immediately sets in.

Tranny fluid looks good and doesn't smell burnt. Is my torque converter going out? Differential fluids contaminated? Nothing has changed about the truck so I'm out of ideas. Anybody experience anything like this?
 

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Truck is making the noise in 6th gear also. Noise increases with throttle application, then goes away when letting off the gas completely.

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