LONG BOX, Allison 1000 6-Speed Automatic, 4WD, Ebony Leather. 2013 GMC Sierra 2500HD SLE INSPECTED & PROTECTED CERTIFICATION INCLUDES: 150-POINT INSPECTION -- You can be 100% confident that each quality vehicle is safe, reliable, and protected. This thorough inspection includes everything from the engine, thickness of brake pads, tire tread depth even the electronics and paint get checked out. Every car you find at John Elway Chevrolet is covered no matter how many miles are on it. -- 60 DAYS UNLIMITED MILES -- For 60 days, every mile you drive is covered -- ALL THE IMPORTANT STUFF -- Engine, transmission, ignition....your protected Check out over 500 positive 4.0 Reviews on Google..