Engine Making Fluttering and Vibration Noises

[Mr300]

I am dealing with a similar noise. Could you describe the sound differently?
I describe it as a growling sound , a gargling sound , a brief humming groaning sound.
It usually lasts about 2 seconds but sometimes at 35 mph it last 4 seconds.
I could find no correlation to the ECO light.
Also, it seems to me that the sound is NOT in front of me. Meaning I don't think its the engine.
It seems to be more underneath me and the bed.
I'm thinking back pressure or catalytic converter or muffler.
I have check for loose brackets. I found nothing.

Let me know if this sounds like the same thing that you are experiencing.

 

[Marshall]

I have had U joints on the drive shaft make strange noise when going out at times.
Can be hard to tell with out undoing them , easy to tell if they have blown up
Full of rust , they will be tight/ seized

 

[ShawnS604]

I am dealing with a similar noise. Could you describe the sound differently?
I describe it as a growling sound , a gargling sound , a brief humming groaning sound.
It usually lasts about 2 seconds but sometimes at 35 mph it last 4 seconds.
I could find no correlation to the ECO light.
Also, it seems to me that the sound is NOT in front of me. Meaning I don't think its the engine.
It seems to be more underneath me and the bed.
I'm thinking back pressure or catalytic converter or muffler.
I have check for loose brackets. I found nothing.

Let me know if this sounds like the same thing that you are experiencing.

Yes, I feel like we are both experiencing the same exact thing. I also agree that the sound is more so coming from underneath the truck. But I feel like the fluttering is happening from the engine. That's the main issue that I can't seem to figure out, and the noise that follows could be related.

 

[ShawnS604]

I have had U joints on the drive shaft make strange noise when going out at times.
Can be hard to tell with out undoing them , easy to tell if they have blown up
Full of rust , they will be tight/ seized

That could be a possibility, but I have zero rust underneath. I was told from a Mopar mastertech that all my control arm bushings are worn and starting to crack. Not sure if that could be causing noises ??

 

[Marshall]

not really rust under the truck, but no grease in the needle bearings in the u joint and the bearing is rust seized is what I meant.