Hey guys I have a really weird issue and i cannot figure out what it is..... When I am driving in 6th gear i get a really low hum and vibration when i coast down. It only happens when i coast and not when i accelerate. It usually happens around 75mph in 6th gear, If i down shift to 5th and coast down the vibration seems to go away. Also sometimes its worse then others and if i push the clutch while in 6th and then engage it again it quiets down..

BTW the car has a new clutch and Fidanza lightweight flywheel


Someone please help!!!!!!!!