Today while driving on backroads I could hear a mettalic click sound immediately after shifting to second from first at about 6.5k rpms. I repeated a few times to verify and the sound repeated: one metallic click or tick immediately after going from first to second at between 6.5 to 7.5 rpms. Sound is similar to exaust cooling down after driving. Sound sounds coming from underbody.

Doesn't make the sound going from second to third, and sometimes no sound at all. Fluids are good. Just had 60,000 maintenance few weeks ago.

Any ideas? Hadn't heard that one sound before. Thanks!