my gearbox is noisey

hi. i am a new member i have a problem with my 1998 v6 24 valve manual galant. the problem being that the gearbox is starting to whine. does anyone have any drawing or information on how to dissmantle repair and reassemble one of these gearboxs?

are u joking? seriously. have u ever seen in a gear box? try changing the oil. my gearbox is whiney but thats just how it is doesn't mean its knackered