I've had three cars of my own, all MTs, and all of them have had a sort of quiet whine noise from the MT, especially when engine braking at low engine speeds (2500 RPM and lower) in second gear for example. Seems like my Civic didn't have it when brand new but I can hear it a bit now. I've also noticed it in my wife's car which we've also had from new, and it only has 23k miles on it.
I'm guessing this is normal -- what causes it? Is it just what the gears do as the spin due to their shape?
I'm guessing this is normal -- what causes it? Is it just what the gears do as the spin due to their shape?