Anybody know what this noise is

[ChevyLee]

sounds like a muffler bearing. just replaced mine, all is well

dale it sounds like you pulled something in the motor. 200,000 it was bound to happen, oh well time for a 6.2

[metalchips]

sounds like a muffler bearing. just replaced mine, all is well

dale it sounds like you pulled something in the motor. 200,000 it was bound to happen, oh well time for a 6.2

:bsflag:Everybody knows mufflers use ball bearings!

I couldn't hear it on the video.
The best stethoscope I have used is a large 2 1/2 foot screwdriver with a plastic handle. Hold the handle to your ear. The doctor type pick up too much noise. Take your fan belt off to eliminate front accessory noise. Jack all wheels off the ground, with the brake on -off in drive should be able to find any drive train noise. Extend the exhaust out side the garage if you can to quiet up that noise.
Check for too much crankshaft end play, you can use that large screwdriver for that all so.
That's all folks.

[Chevy366]

Flywheel/Flexplate ?
Engine compartment or rear of truck ?
Sounds like a 6.0 or 6.2 L and a 4L80E .