Just got a new '18 GC Overland with the V6 and am experiencing a shudder feeling (almost like a belt slip) when driving 50MPH+. I have turned off the ECO mode and nothing changed. I have Active Safety Group, so I turned off the lane departure system and it seemed to get a little better, but am not sure. I am going to try various things today to replicate the problem (See if it happens while cruise control is activated, etc.), but am at a bit of loss as this is a brand new vehicle. I've searched the forum and couldn't find anything similar. Does anyone have any ideas of what is happening? Thanks in advance!