2008 SS/TC 75k miles. I've noticed lately that when I back out of a parking spot, or try to correct my parking by backing up and turning, I hear a single clunk that sounds vaguely like it's coming from my front end. It only happens once and only in reverse. I can kind of feel it in the steering wheel too. I did new struts, shocks, and springs about a year ago and everything has been perfect until about a week ago when this started happening. I did some googling and can't really find anything describing exactly what I'm hearing/feeling.
Any thoughts?

 

video?

 

it is the diff pin unlocking in reverse