I have a 2015 regular cab 4x4 with 12,000 miles...yes I baby it. I have this issue of high frequency vibration that I can't pinpoint. Yes been thru the dealer since its still under warranty. I get the old run around. Started two star cases, also run around. Everyone says its normal. I say its not. Worse prior to shift points, but normally always there. When I take it out of MDS mode its half as bad. Is it the torque converter, is it the transmission, is it the motor, is it the MDS, ??? Or is it something completely different. I'm at wits end and want to figure this out once and for all. Besides the high frequency, it shudders also. Hope a Ram Care rep see this. Thank You.