Include

[RigRunner]

Thanks Roy. I have not considered that the muffler may be causing the rattle (harmonic). I will check into that.

I failed to mention that truck does have an aftermarket exhaust (which I have yet to identify the mfg) and tip.

Guess I shold remove "stock" from my signature.

What is the easiest way to identify the mfg of the exhaust? I have looked up and down the exhaust and can't seem to find any indication of the mfg.

Thanks