GSXRROCKER

Ok, so i'm running down the freeway around 90 in 6th and it sounds like it fell into a false neutral... So I dropped back into 5th and tried 6th again and it was the same thing... When I got off the freeway and put it in neutral at the light it sounded like there was a gear skipping off another, it wasn't consistant but sounded like it was just being pushed in by the moving oil... I was thinking it might be a broken shift fork but it shifts between all the gears just fine, so I think it might be that one of the two gears that make up 6th is fucked...

Anyone have any experience with this? Any idea?