It's a rotating gear type sound that I hear all the while I am driving. It sounds like its coming from the dash or engine compartment but if you put your ear down by the shifter you will immediately recognize the sound. It's gearbox noise. My 2004 C5 Corvette's Tremec 6 spd. made the same sounds but mostly it was thru the shifter and then I could stop the rattling sound by holding the shifter. What an awesome car my 2018 is. But noises like this can sure distract one from enjoying the car. Anyone with the same concerns? Is there an mechanical issue or is this the norm for a Tremec tranny? If it's the later then I am very disappointed with Ford.