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I'd say it's the decoupler making that sound. My 03 has been making that sound for a while now. I took the cap off of the decoupler and sprayed a little PB blaster in there, it helped for a little bit, but not long. I'm just going to wait until it completely breaks or the alternator quits charging.
2007 Grand Caravan/3.8L V6/103K mi/original 41TE
2006 300C/5.7L HEMI V8/128/K mi/original W5A580
2002 PT Cruiser/2.4L I4/139K mi/original 40TE
1992 S-10/4.3L V6/249K mi/original 4L60E
1997 Grand Voyager SE/traded@192K mi/3.3L V6/original 41TE
2003 Grand Caravan Sport/3.8L V6/traded@124K mi/original 41TE
2007 T&C/3.8L V6/traded@44K mi/ original 41TE
2010 T&C Touring/3.8L V6/the ex's@72K mi/original 62TE