Finding the cause of the noise is now a mission.

Only happens when foot is on the gas pedal, so I am not thinking a belt

Maybe U joint is going?

 

Is there any way that you can put up a video of the sound? Where does it sound like it's coming from? Keep in mind that sound will bounce like crazy so keep an open mind and ear.

 

does it do this sitting still?

sound metallic? like tick tick tick
could it be air? like pff pff pff

 

check rear drive shaft u-joints. truck level, in neutral, parking brake off, wheels blocked.... (don't get run over), and with all tension off the drive line - rotate the joint halves against each other. seal should be intact and no movement/play. you can use a screwdriver for a little extra leverage.

 

I've not long had my Ram and I have recently noticed the same issue, seems to be a lot more noticeable in O/D, I'm struggling to find the source but its definitely somewhere under the hood. If anyone has previous experience with this it would be a big help.

 

Sounds like an exhaust leak

 

sounds like the front ujoints are wasted... they always make a clicking sound. other then a ujoint would be something internal in the motor but there would be other signs

 

a collapsed lifter only makes a tick- there are other ways to tell, but only if you are looking for a collapsed lifter..

an exhaust leak can be found real quick like with some seafoam through the brake booster line into the intake manifold..

u-joints can be confirmed by crawling up under there and shaking the shafts (yeah, I said that, leave it alone now) to see if there is ANY play there..

a timing chain that is excessively loose can slap, and sound like a tick.. that will also follow the tach's rhythm.

a rod or knuckle joint can tick.. let's hope it isn't a rod or knuckle joint..

a harmonic balancer can tic.. you'll see it wobbling up the rotation of the belt though..

 

I agree.