I'm looking for some help identifing what a noise is coming from. It's a 2012 f150 lariat ecoboost 2 wheel drive. The noise sounds like a ratched being spun. It only happens after bout 1000rpm an usually stops at 2000rpm. Speed of the clicks go up an down with rpm. From what I hear it's down low on the drivers side. Any help very appreciated.

 

Check exhaust shields to start.