i've never heard a g/box go bong. i've heard them go crunch,crash,grind and even screech but never bong. i've even heard one that sounded more like a jukebox than a gearbox but never bong
oh come on yopu must have heard a bong noise before!! it goes sortta like this.........slurp slurp burble burble slurp........ then you get all hungry for a mars bar