Ok, before anyone freaks out, this has happened all of four times since I purchased the car about two months ago. I can't seem to reproduce it at all; it just sorta happens occasionally. I'll get a light Thunk with a slight jerky feel in the shifter when dropping down into third. Never happens under power; only when I'm slowing down and dropping through the gears. Not particularly noticable and its more of a feel than a sound. Any ideas?

 

TTT. Anyone have any ideas?