OK. I purchase and the 08 GT sept. 2010 with 13,000 miles on it. Now its at 22,000 so in all respects its still fairly new. I bought it Certified Pre-Owned. Its a 5-speed Hurst it came that way. I put on slp axle backs. its been running great. I have been using mobil 1 oil and napa gold filters. I am on vacation and i have a vibration noise coming from over where the clutch, transmission and the exhaust manifolds come down. I have done the best to isolate the noise. if you pop the hood its not coming from up top its down below. I checked the oil its clean no metal shavings. I have found that at idle it doesn't really make the noise. It seems to only happen at certain rpms any where from 1200 to 1800. If anyone has any ideas it would be a great help. Thank you!