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Thanks... I've just gone under to test the heat shield idea. I can't rule it out yet, but I'm hearing a "pebble shaking in a can" sound from the area of the cat. It seems to me to be more "inside" than "outside". What do you think about a failing catalytic converter with a broken piece being...

1997 2WD Explorer With vehicle standing still, brake on, start engine and shift from P to R, metallic rattle under front starts up, but lessens in a few seconds. Shifting to N, noise stops. Shifting to D, noise starts again, but less loud and lessens quickly. Last week, I briefly had a...