Exactly that. When changing very quickly from 1st to 2nd or if changing gears hurridly and sloppily there might be an occasional wirr or buzz type noise as I imagine the gears and synchros have a little operator induced disagreement and feed a high frequency low amplitude vibration up the gear stick. It can last for only a fraction of a second before gears engage or sometimes it'll be like a wall and would buzz for as long as you tried to force the lever back into second. Leaving you to slow things down and try again.Originally Posted by yfin
Other times it could be a definate low frequency, medium amplitude coarse mechanical noise like the raspy sound of clearing your throat. Which is what I'd personally consider an embarrassing "teeth cleaning" session.
Both are noises no one likes to hear as the operator is inducing undue mechanical wear on it's components. I've experienced the latter about twice in the 33000km's I've had my car, and the former probably at least once per 10,000km. If you hear or experience it once, there'll be extra metal contaminants in the MT fluid besides that from gears mechanical interface. That doesn't mean you need to change your fluid every service, it's just what I personally like to do.
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