My brother has an 02 GT that make a wierd nosie, its like a cross between a rattle, chirping and squeaky noise, that is only there when its in a gear. It goes away when he pushes the clutch in but other than that it gets worse when he gets on gas, starts to make the rattle noise real loud and its real bad around 3000rpm. He has replaced the clutch and pressure plate and throw out bearing on it. When he first bought the car(hes had it about 3 1/2yrs.), wasnt to great with a stick, he hit second gear instead of fourth at about 100mph, he took it back to the dealer and all they found wrong with it was a bent valve(lucky if you ask me) and they replaced the head. The noise has progressivly got worse since then and I/he doesn't have ideas about whats causing the noise, I think its somthing to do with what he did but I don't much about manuals, so any help would be appreciated thanks. Oh yeah and someone told that the syncros in the tranny might be bad, but I don't know.
That would be very bad.... i dont think its one though.