Originally Posted by
K6-III
The strange thing is that it drags in 3rd, but not in 1st (both gears use the planetary system). That implies to me that you're not getting full engagement in 3rd gear, or some of the internals are contacting one another. It's tough to say without opening it up.
different sets of pawls engage the hub shell in 1st and 3rd. This is why I think in 3rd, the side which does not engage, ie which would produce the ticking while pedalling in 3rd, is the side which is dragging its pawls or something against the shell.