I have the same problem...as stated above about kicking the throttle down to pass, the trans drops too far and over revs the motor to the point it will not pass but makes lots of engine noise. I was told by the Dealer this was normal....since then I have readjusted my way of driving. I'm glad that more people are coming out and saying they have the same problem, my truck is a 2012 Lariat 6.2.