2023 GMC Sierra HD AT4
2023 GMC Sierra HD AT4 OVERVIEW 
2023 GMC Sierra HD AT4 For Sale
- Available 6.6L Duramax Turbo-Diesel V8 Engine with Allison 10-Speed Automatic Transmission
- X31 Off-Road Package with Twin-Tube Rancho Shocks and Skid Plates
- Available 20" High-Gloss Black Aluminum Wheels with All-Terrain Tires
- Exclusive Athletic Interior with Jet Black and Kalahari Accents
GMC Sierra HD AT4 For Sale
2023 GMC Sierra HD AT4 PERFORMANCE 
MADE FOR OFF-ROAD
- 2-speed AutoTrac® transfer case with an active automatic 4WD drive setting helps provide seamless shifting between two- and four-wheel drive based on road conditions
- Hill Descent Control
- Skid plates provide added underbody protection
- Equipped with Off-Road Mode
- Off-Road Suspension with Rancho® Shocks
CAPABILITY WITHOUT COMPROMISE
While the 2023 Sierra Heavy Duty offers powertrain advancements across the lineup, the legendary available Duramax Diesel engine and 10-Speed Allison Automatic Transmission continue to offer the in pulling power excellence:
- The 6.6L Duramax Turbo-Diesel V8 engine delivers an impressive 445 HP and 910 lb.-ft. of torque
- The Allison 10-Speed Automatic Transmission allows the engine to operate in an optimal range with varying load and terrain conditions
RESPONSIVE SUSPENSIONS
- Denali and AT4's independent front suspensions provide excellent wheel alignment, ride comfort and turnability with reduced weight
- Live-axle suspension includes two-stage, semi-elliptic multileaf rear springs to balance payload management and ride quality
2023 GMC Sierra HD AT4 APPEARANCE 
WORLD’S FIRST SIX-FUNCTION GMC MULTIPRO TAILGATE
Offers six distinct functions. Designed to help improve loading, unloading and accessing the cargo box.
SIDE BED STEP
The Side Bed Step conveniently located just in front of the rear wheel arches complements the large CornerStep rear bumper to help provide easy access when grabbing equipment from the cargo bed.
DUAL PATH AIR INDUCTION SYSTEM
The Dual Path Air Induction System on the available 6.6L Duramax® Turbo-Diesel V8 engine draws dense, cool air through both the hood scoop and the large front grille to provide cooler induction air temperatures to help optimize horsepower and trailering performance.
2023 GMC Sierra HD AT4 COMFORT 
AVAILABLE REAR SEAT STORAGE
Convenient and spacious storage solutions include rear seatback storage, perfect for stowing a smartphone and your other road trip essentials.
SPACIOUS CENTER CONSOLE
Lighted center console storage with available console-mounted safe accessory, and large lower lockable glove box and upper glove box.
WIRELESS CONNECTIVITY
It’s OK to leave the cords at home. The available wireless charging pad has excellent charging abilities. Wireless phone projection via Apple CarPlay® and Android AutoTM compatibility.
AVAILABLE BOSE® PREMIUM SOUND SYSTEM
The BOSE Premium Sound System supplies seven well-placed speakers along with a Richbass woofer to produce powerful, high-quality concert-like sound wherever you go.
2023 GMC Sierra HD AT4 SAFETY & WARRANTY 
PRO GRADE PROTECTION
Standard on every new GMC - GMC Pro Grade Protection has you truly protected with features and services including:
- 3-year / 36,000-mile Bumper-to-Bumper Limited Warranty
- 5-year / 60,000-mile Powertrain Limited Warranty
- 5-year / 60,000-mile Roadside Assistance & Courtesy Transportation
- 3-year / 36,000-mile Corrosion Protection
- 6-year / 100,000-mile Rust-Through Protection
- First maintenance visit
AVAILABLE LANE DEPARTURE WARNING
This feature can alert you if you might be unintentionally drifting out of detected lane lines so you can quickly take action. It will not alert you if you’re using your turn signal or it detects you may be intentionally leaving your lane. Standard on Denali. Available AT4, SLT and SLE.
AVAILABLE FRONT AND REAR PARK ASSIST
Front and Rear Park Assist can provide alerts to nearby detected objects in front of or behind your truck to help you park and avoid collisions at low speeds. Standard on Denali. Available on AT4, SLT, SLE and Sierra HD Pro.
SAFETY ALERT SEAT
The available Safety Alert Seat uses left, right or both-side driver seat vibration pulses to help you identify the direction of potential crashes so you can quickly take action. You can also switch to beeping crash avoidance alerts. Standard on Denali. Available on AT4 and SLT.