[Eighty 6]

Hey there, Ive noticed a rattling noise coming from the gear shift location at high RPM's, its a manual. Dosent matter what gear its in, I get the noise when the RPM goes past the 5000 mark, im assuming somethings come loose because ive belted the hell out of it and its under warranty so what do you guys think happened? Sounds a bit like metal on metal its currently done 15000 kms. Still runs fine, gears change smoothly but just that ratteling noise is a concern