Noises from Down Below

My 2003 Ford Explorer, Eddie Bauer 4WD is making noises when the vehicle is at 2000RPMs. Below or above 2k RPM’s no noise. Sounds like a very angry rattle snake. I seem to drive at speeds that require it to be at 2k RPM all the time. So needless to say as fall is approaching and I have the windows open, my hair is now falling out and not blowing in the fall air. I want to get it looked at, but don’t know what to tell the mechanic to look for. Any help?

The best hope would be a loose heat shield or clamp on the exhaust system.

Have your mechanic drive the vehicle. Noises are typically difficult to diagnose from someone else’s description.