This is a fully loaded 2021 Denali 3500 with the new 10 speed transmission. It currently has 36,075 miles. There is no issues with the truck. It’s has been babied and meticulously maintained. I had plans to make this a promo truck for my business, but plans changed and I need to put that plan on hold. The only modification it has is a Banks Pedal Monster to improve response and economy depending on the setting. You can message me with any further questions.