I have a 2018 Titan XD (Gas) with 30k miles on it. They completed the 30k service the week before christmas and I had to travel. Truck was great the entire week of travel and then on Sat I went to the store and when I put the truck in reverse it was as if it didnt have enough vaccum/pressure to move back. I sat there with it gear and then it would take about 3 seconds before it would back up. All the drive gear work perfectly. I took it to the dealer and the tech without even running tests, cheching the fluid, or dropping the pan to look for metal shavings called and said it needed a new Transmission. Would it possible the shifting solenoid is bad or has anyone seen this type of issue. Thanks in advance.