Here is a hint. lift vehicle.drop exhaust shielding around center support bearing for driveshaft. Inspect tunnel insulation and you will find it rubbing against the driveshaft right in front of the center support bearing. If this is the problem, there is a DTB to make a strap to support the insulation. Basically cut a 6 inch section of aluminum strapping about 1.5-2 inches wide , drill a hole in the center, and fasten it with the 10mm plastic nut. I usually put some semetric angles in the piece ( kind of hard to explain) to add strength.