So my 05 xb12 has developed an odd clunk in third gear only. Rolling on the throttle in third it feels like a tooth is missing g on the drive belt or something. I am worried it is third gear teeth missing or effed up. Drained primary oil and it is a little shiny. But it has always been this way. Change it once a year. No chunks I thought maybe it was something in the tune. Like a weird dead spot. Reverted back to an earlier tune, same thing.