GMC Sierra SLE 2021 Used mileage: 240 KM GMC Sierra 2021 Mileage: 240 Sierra 2021 Mileage 240 Body is agency from bumper to bumper, guaranteed. Undercarriage completely redone. Gearbox is agency. Engine had lifters changed due to a manufacturing defect. And the DOD system was canceled. Interior is clean. *Additions* Protection on the front lights. 40,000 BTU transmission cooler. Serai switch. ABS switch. Mirror switch. Bed cover. Bed fishing rod. And interior lighting.