I've never posted on a forum before, but I just purchased a used 2012 Dodge Ram Sport with the Hemi 5.7. I have loved everything about the truck, inside and out. Recently I had "put the pedal to the metal" while in 1st using the slap shifter and with the higher RPMs I heard this tinny vibrating noise like something was lose and the higher RMPs are causing it to rattle and make the tinny vibrating noise. This sounds isn't heard under normal driving conditions. If I continue to keep hearing it, I am going to take it into Dodge under original warranty. I just wanted to see if anyone else knows or has experienced this tin can vibrating like noise when really getting on it. Thanks in advance!