I have searched and searched and i could not find anything related. I just got a SC with 128k. Im hearing a whirling noise when i'm in 3rd gear. What could this possibly be? If it something internal what should my next step be to do?

 

My friend has the same problem in his SC400 and he thinks it could be a bearing. So yes it could be internal and I would just leave it be until it goes. His problem has been going on for almost a year now and it still runs just fine.