Sierra metal rattling noise when cold

[Millertimeofd7]

I have a 2014 with a Gibson cat back exhaust system.  Only when it's cold and driving i hear what sounds like a heat shield rattling.  Checked that and was ok. Clamps all seem tight. Not sure if it's the cat or muffler?

[300 Blackout]

From underneath your car, wiggle the gas tank shield up and down and see if that’s the sound you hear. I was surprised by how much play mine had in it.

[Millertimeofd7]

On 10/25/2018 at 7:55 PM, 300 Blackout said:

From underneath your car, wiggle the gas tank shield up and down and see if that’s the sound you hear. I was surprised by how much play mine had in it.

Thank you for the reply.  Nope got under the truck checked the entire heat shield and really no movement.