I have a 2013 Mustang GT, 6 speed manual with 700 miles on it. Ive noticed a clack/clunk when shifting 1-2, 2-3, and sometimes 3-4 or when under heavy load. The only way to avoid it is to let off the clutch very slowly with a lot of slip...and even then it still makes a slightly noticeable clack. Not sure if its coming from the clutch or backlash in the rear end. Is this normal build quality or should I take it to the dealer for a warranty claim? Thanks guys.