Quality Buick GMC

1620 East Homer Adams Pkwy Alton, IL 62002

Check Out Our Inventory

2023 GMC Sierra HD AT4 OVERVIEW Overview Icon

2023 GMC Sierra HD AT4 in Alton

Get Current Pricing*
  • 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
2023 GMC Sierra HD AT4 Main Img

GMC Sierra HD AT4 Dealer in Alton

2023 GMC Sierra HD AT4 PERFORMANCE Performance Icon

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
2023 GMC Sierra HD AT4 performance

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
2023 GMC Sierra HD AT4 performance

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 Appearance Icon

2023 GMC Sierra HD AT4 Appearance Main Img
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.

2023 GMC Sierra HD AT4 appearance

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.

2023 GMC Sierra HD AT4 appearance

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 Comfort Icon

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.

2023 GMC Sierra HD AT4 comfort

SPACIOUS CENTER CONSOLE

Lighted center console storage with available console-mounted safe accessory, and large lower lockable glove box and upper glove box.

2023 GMC Sierra HD AT4 comfort

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.

2023 GMC Sierra HD AT4 comfort

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 Safety Icon

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
2023 GMC Sierra HD AT4 Safety Main Img
2023 GMC Sierra HD AT4 safety

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.

2023 GMC Sierra HD AT4 safety

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.

2023 GMC Sierra HD AT4 safety

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.

Check Out Our Inventory

Disclaimers