This is a pretty unconventional question for here, but I figure you might have an idea of what this is. The transmission was built with alto red eagles and a circle d converter about 6000 miles ago and the car has 10500 miles on it right now. I used to always drive with music on, so maybe it's always done this since the rebuild and I'm just noticing it now after driving with music off?
In the video I was sitting still and repeatedly shifting up/down from 1-2. My phone's mic was placed in direct contact with the shift knob to make the sound carry through, so keep in mind that it's not nearly as loud in the cabin as the video makes it seem. Am I being paranoid? The transmission still shifts perfectly but I want to be cautious, as I had to rebuild the trans at 4000 miles due to poor tuning (TM cut in half, shift times cut in half, and stock pressure) combined with the transmission being hurt from the factory (it was acting up a bit before the tune, too). I don't want a repeat of that debacle.
https://www.dropbox.com/s/yl5clwdsk81pyp3/2016-07-13%2002.10.37.mp4?dl=0
Just tried to record the sound again and it doesn't do it when freshly started up, only after it's been driven for a little bit it seems.