Hi I have a 2014 6.7 with 44,000. It has a hard shift when going to pass and if towing sometimes it really shifts hard. Doesn't do it everytime and seems to happen when truck has been running a while. I will say though it's happening for frequently. It throws your head back and is loud. Everything is stock on the truck. Bringing it into the dealership Friday to have oil changed, fuel filters done, and checking out this transmission deal. It also seems delayed when coming to a stop and driving forward. Like stop sign or light. Something just doesn't seem right.