At4 Premium Package At4 Preferred Package Driver Alert Package Ii Lpo At4 High Clearance Step Engine Duramax 3.0L Turbo-Diesel I6 Sunroof Power Driver Alert Package I Sun/Moonroof Leather Seats Satin Steel Metallic Navigation System Tires Lt275/65R18C Mt Blackwall Goodyear Wrangler Duratrac Engine Block Heater Lane Keeping Assist Keyless Start Cooled Front Seat(S) Adaptive Cruise Control Alternator 220 Amps At4 Preferred Equipment Group Audio System Premium Gmc Infotainment System With Navigation And 8' Diagonal Color Touch-Screen Includes Multi-Touch Display AM/FM Stereo Automatic Emergency Braking Bose Sound System Premium 7-Speaker System Emissions Federal Requirements Following Distance Indicator Forward Collision Alert Front And Rear Park Assist Ultrasonic Front Pedestrian Braking Gvwr 7100 Lbs. (3221 Kg) Intellibeam Automatic High Beam On/Off Jet Black With Kalahari Accents Perforated Leather Front Seat Trim Lane Change Alert Lane Keep Assist License Plate Kit Front Rear Axle 3.23 Ratio Rear Cross Traffic Alert Safety Alert Seat Seats Front Bucket Seats Heated Second Row Outboard Seats Tire Spare 265/70R17Sl All-Season Blackwall Transmission 10-Speed Automatic Electronically Controlled Universal Home Remote Wheels 18' X 8.5' (45.7 Cm X 21.6 Cm) Machined Aluminum Window Power Rear Sliding With Rear Defogger Wireless Charging This vehicle includes a Money-Back Guarantee* and passed our precise inspection process. Best of all the price you see is the price you pay. No haggling. No back and forth. No pressure. And this price is so good it is guaranteed. *Money-Back Guarantee is valid for 5 days or 250 miles, whichever comes first. Subject to certain terms and conditions. See store for details. Some restrictions apply. 2021 GMC Sierra 1500 AT4 4x4 Duramax Diesel, One-Owner, Colorado Truck This 2021 GMC Sierra 1500 AT4 4x4 is a premium off-road truck combining Duramax diesel efficiency with rugged AT4 capability and refined comfort . With 79,697 miles , this Sierra stands out as a clean, one-owner Colorado truck with excellent history and strong maintenance . Powered by the highly desirable 3.0L Duramax turbo-diesel inline-6 paired with 4x4 , this Sierra delivers impressive torque, towing capability, and fuel efficiency in a full-size truck platform . 1CARFAX Ve...T4MG106749 , PDF Vehicle Highlights 79,697 miles 3.0L Duramax Turbo-Diesel I6 1CARFAX Ve...T4MG106749 , PDF 4x4 drivetrain 1CARFAX Ve...T4MG106749 , PDF AT4 off-road trim package CARFAX 1-owner vehicle 1CARFAX Ve...T4MG106749 , PDF Colorado-owned since new 1CARFAX Ve...T4MG106749 , PDF Performance Capability Efficient and torque-rich Duramax diesel engine Excellent towing and highway driving capability Smooth, confident 4x4 performance for all seasons Ideal for towing, commuting, and mountain driving Strong fuel economy compared to gas V8 competitors AT4 Off-Road Capability Factory AT4 off-road suspension and tuning Skid plates and off-road protection Enhanced traction systems for snow, dirt, and trails Raised ride height and aggressive stance Interior Comfort Premium AT4 interior with refined materials Spacious Crew Cab configuration Dual-zone climate control Power-adjustable seating and modern cabin layout Quiet, comfortable ride for long-distance driving Technology Features GMC infotainment system with touchscreen display Apple CarPlay Android Auto compatibility Bluetooth connectivity Backup camera and driver assistance features OnStar capability with connected services 1CARFAX Ve...T4MG106749 , PDF - Service Condition Highlights Recently serviced at AutoNation Buick GMC (Feb 2026) including: Battery replacement Brake inspection Full system check 1CARFAX Ve...T4MG106749 , PDF Emissions inspection completed Regular ownership history and consistent use Dealer inspected and ready for delivery Ownership Vehicle History 1-owner personal vehicle 1CARFAX Ve...T4MG106749 , PDF Colorado-owned since new 1CARFAX Ve...T4MG106749 , PDF Clean CARFAX no accidents or damage reported 1CARFAX Ve...T4MG106749 , PDF No structural damage or airbag deployment No open recalls reported 1CARFAX Ve...T4MG106749 , PDF Clean title - Why This Sierra AT4 Stands Out Desirable Duramax diesel AT4 combination One-owner, clean Colorado history Strong mix of off-road capability and daily comfort Proven reliability with recent service Excellent value compared to newer diesel trucks This 2021 GMC Sierra 1500 AT4 Duramax 4x4 delivers premium off-road capability, diesel efficiency, and everyday usability available now at AutoNation Chrysler Dodge Jeep Ram Arapahoe .