Whenever I'm not accelerating, there is a rattling sound which seems to be coming from behind the passenger seat. I'm guessing it's related to the gearbox, because it goes away when I put slight pressure on the stick and push it more towards the gear - but comes back as soon as I let go. I'm going to call the dealership tomorrow and see what they want me to do, but was just wondering if anyone else has experienced this or has any ideas...