I figured out the noise. The plastic panels underneath the chassis were loose. I snapped them back into place and the noise disappeared.
The panels are located on the underside of the chassis, below the door thresholds. If you look under the body, you can see them. I?m not sure of their purpose. If they are loose, you can hear them click/snap into place when you push/press on them.
Billy B- Proud Stinger Owner