Ive got a MY17 manual Redline which has driveline vibration and noise at about 80kmh. I first noticed it with less than 200km on the clock. It mainly does it when slowing down from more than 80kmh when in 5th or 6th gear. Push the clutch in, speed up or down from 80kmh, drop it into 4th and the noise/ vibration goes away. Anyone had anything similar? I took the tech out for a drive and he acknowledged there is an issue and it's a call to Holden.