Rattling whistling noise

Hi, hope the question hasn't been asked before. I searched, and I could only find information about grinding. Thats not what I have. It's a rattling metallic noise. very faint. Seems to only happen in 2nd gear though. I made a short video for YouTube showing the problem so you can listen for yourself. No other issues.



http://ift.tt/1CSYHJr



Again, I do apologize if someone asked about it before. Not trying to upset any of the members here. :)