Anybody else getting this? Under hard acceleration and just before shifting (4,500+ rpm) if I have a window down or the back slider open I can hear (80% of the time) something 'metal' under the truck sound like it's grinding light metal shavings!

2013 Ram CC Hemi 4x4 3.55 with less than 10k miles. It's been happening since ~5k miles and dealer hasn't been able to diagnose. Now I may be making things up but it almost feels like the tranny is slipping too!