That's a good question.  I believe sometime in 2015 Ford may have made changes to the transmission based on the following: on or before 3/1/2015, based on Ebay listings for transmissions, early transmission through 3/1/2015 are shown to fit only MY 2013,14, and 15. on or before 8/15/2015 based on the TSB 16-0105 - "Some 2013-2016 Fusion, MKZ and 2013-2015 C-Max vehicles equipped with an HF35 transmission and built on or before 8/15/2015 may exhibit a thumping/rubbing or grinding noise coming fro