Well took my '06 Solstice in today at 14,500 to have the differential looked at for the same clunking... turns out the dealership called and told me that they need to replace the differential... won't have my ride for a week!

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2006 Mysterious purchased back in June '06... GM CAI and catback exhaust, 15% tint, Moda MD2's, debadged rearend, smoked lights (all of them), painted windshield frame, blackened grilles, blackened rear fascia, and vertical doors. Many more mods to come... I'll keep you posted!