In preparation for a trip with my dogs, I just (5 minutes ago) pulled the rear carpet out of my 2-door today. When I closed the tailgate I noticed a really unnerving rattle - the heat shield above the muffler. I tapped a bit on the rear floor and noticed it rattling with very gentle tapping. Got under the Jeep and flicked it... sure enough, rattles. I reached up above it since everything was cool but none of the nuts holding it in place (that I could reach) feel loose at all.
I haven't noticed it while driving yet, but I'm sure I'll be listening for it tomorrow.
Is this normal? I can't tell if it's actually vibrating against something, or just resonance and angles and whatnot. I've got 4,000 miles and would be upset, though not surprised, if something's broken.
DISREGARD, PROBLEM HAS BEEN SOLVED