Am I a missing something something? This is my first diesel and first Ford. I bought a new F350 Lariat 2018 about 6 weeks ago. It has occasionally seemed to have trouble shifting up but goes away. Today was first time pulling my 4 horse trailer with LQ. When coming to a stop the transmission was extremely slow in downshifting. Slow enough to have me worried. Anyone have any ideas or thoughts? Do I need to take it back to dealer to have it looked at. Only has about 1700 miles on it. Thanks in advance for any opinion.