Hi,
If you have a helper sit in the vehicle with it running and in gear, see if you can tell approx where it is coming from. It could be the exhaust rattling or nearly anything on the vehicle.
I can tell you that it isn't uncommon for the heat shields to come loose and rattle. There are some on the exhaust system and there are some bolted under the vehicle between the exhaust and the floor. Those ones usually come apart and can rest on the exhaust causing this kind of noise.
If it's possible, record the sound and upload it for me to hear. Hopefully, it will be something I heard in the past and will recognize. Also, take a rubber mallet and tap on the exhaust to see if you can reproduce the noise.
Let me know.
Joe
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Saturday, May 29th, 2021 AT 9:22 PM