I have a 2015 2500 w/ Cummins w/ 31k on the odometer. Was heading out of town this past Friday w/ a 13k lbs 5th wheel in tow, and lost all forward gears in tranny. Was towed to Dodge/Ram dealership and was told due to backlog of transmission work, transmission tech won't likely fix/address for several weeks. I got a similar story from another nearby RAM dealership. Meanwhile, I'm out of pocket on a rental car b/c dealership hasn't cracked open the tranny to make a diagnosis, and I'm told only five days of rental car will be covered anyway. Despite being upside down on truck, I'd trade tomorrow for a 2017 Duramax/Allison combo if they were available on the lots. I've had it with RAM.