i have a 93 civic with a b18c1 w type r internals and a b16 head when i gear down i get this quick like scraching noise when its higher rpm when i gear down at low rpm it dosnt do it... also when im in a high gear 4th or 5th and im goin slow it can some times make a weird rattle kinda noise... i was thinkin my syncro's r maybe gone in my tranny but not too surez??