Clunk when changing gears.

Ofcourse this can not be diagnosed like this but I'm atleast looking for any helpful pointers or perhaps knowledge from someone who has had similar issue.

Anyway. I did few 0 to 100 accelerations just to see if my car is actually 86hp or not. I did not hear or have any issues. In fact everything worked just fine after few accelerations and even when driving home. But later I noticed that there was a slight clunk when I changed gears and let go of the clutch. It doesn't happen when I select a gear. They seem to go in just fine but when I let go of the clutch then I hear a clunk. When I'm stationary and change gears, press clutch in and let go, there are no noises or anything. Only happens when driving. 

I have noticed for a while now that I can hear and feel engine vibration more prominently than before so I'm assuming it could be a the dogbone mount that is busted? Damn weather sucks so I don't feel like crawling under the car right now.