Hi, can somebody tell me what this noise is when I move the rear shift from either Park --> Drive or Drive --> Park? I'm guessing it's supposed to be happening, but not not sure what the noise actually is. The noise lasts less than 1 sec and kind of sounds like a screw winding up or down. It's subtle with the windows closed, but seems loudest around the rear wheels if you stand outside while performing the shift. Anybody know what this is?