So, i know there is another thread out there that resembles this one. However, my question is more so to the proposed try-solution that was given to me by a Hyundai dealer. I own a 2013 2.0T A/T with 94k on it. When the car is warmed up fully, and I have been doing the stop/go traffic back to back, my car has a hard shift from 2nd to 3rd. I wouldnt really say it is slipping, but it feels as though the gear shift is just taking longer and the RPMs are lengthened during the shift. Additionally, you can feel it shift a little rough. The dealer I called recommends that i get a transmission flush and says that it is most likely the issue. What do you guys think about that advice?