I hear a metallic knocking noise coming from my stacks, Its under load in the lower band of rpm. above 2400 it disappears and when the truck is next to my garage and i idle up, idle to 2700rpm no noise (no load)??? doesnt change no mater what the setting and did it before the edge

It along with a grind (like brakes) been driving me up a wall for 5 months. Cant find it. Checked brakes, joints, no drag or noises turning by hand.

Anyone close to canton Ohio wanna let me ride with them to see if its me, i did come from a powerstroke so its a different beast. Also want to test a smarty.

Is timing rattle from the engine? (yes, but the sound)

Im going crazy and my friend hears it and i don’t think a shop will know what to look for. Please Help Thanks Jordan

 

started looking into it talking to friends and thinking it may be the echo of exhaust... anyone with stright notice this? The stacks may be making it noticable because its right behind me... Maybe?

What would fix it with out killing sound too much brand model? Thanks

 

You might be getting a harmonic resonance from the stacks at that rpm-try taking the stack pipe off and trying it again at that rpm and see if it goes away (kind of like a trombone?)