you will have to be a bit more detailed in your description of your fault,is it noisy sitting in neutral?does it go away when you put your foot on the clutch?are you getting gears ok?do you get the noise at a certain speed?is it there as soon as you pull away?any leaks from your g/box?
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix cars.