2005 - 2014 MustangsDiscussions on the latest S197 model Mustangs from Ford.
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Watching your video, I actually saw no malfunctions. What I saw seemed to be a normal operating 4.0 and your slight movement is nothing to be worried about. The 4.0 balancer, when it's bad, will definitely be evident.
An easy check though is take a white marker and draw a line from the center of the pulley straight out to the edge. Check that after driving and see if there is any movement. When the balancer goes it will wobble enough to break the straight line.
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