Why does my Civic 5spd clunk from reverse?

I have a 2001 Honda Civic 5 speed 1.7L and when I back up and let off the clutch there is a pop/clunk sound from the front end. It seems to only do it after pushing in the clutch and releasing power after reverse. I can't find anything obviously loose, is it the CV, tranny, or something else?

Read more: Why does my Civic 5spd clunk from reverse?