Name that Noise

[govener71]

A link to a video of my truck is below with the noise very audible. There is the typical valve train noise and then a lower tone noise.

 

https://youtu.be/WtcCUcn24IA

 

A little about my truck:

06 Silverado, 1500, 4x4, Vin Z, 5.3, Crew Cab, 210,000 Miles, rebuilt motor with new lifters and cam at 97,000 miles. I have replaced the belts and tensioner. Oil pressure 30-45 while driving consistently. 
 

Any thoughts about where to start looking or trying?

[CamGTP]

Kinda sounds like a loose heat shield or something. A cracked flex plate is usually louder than that but still a possibility. A long shot would be the windage tray in the low end of the engine is loose and causing that vibration/rattle noise.

[govener71]

I can easy check if it is a heat shield by banging around underneath the motor and exhaust, good thinking, but is there a way to check the other two things?

 

The noise is somewhat inconsistent. It mainly happens when everything is warmed up and has been on for a while. It doesn't happen when it is a cold start and idle. Only a warm idle. 

 

Side note about my oil pressure. I tried parking on a very steep hill. My back end was up about three feet higher than my front end. I had no change in oil pressure, so I am thinking it is not my pickup tube seal. Maybe the sending unit screen....

[Brian715]

One thing to think about is, does the noise change frequency with RPM? This will help narrow down a little if it's something that is rotating with engine, which to me it sounds like it is. That would make a heat shield or something less likely. Maybe try a stethoscope to help locate it. Hope you can figure it out.