2024 GMC Sierra 2500HD AT4 Specs

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GMC Sierra 2500HD
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The majority of GMC Sierra 2500HD trucks will spend their lives on the road, carting goods and people between school, work, and places of business, but some owners appreciate the great outdoors and need a truck that can take them off the beaten path. For these people, GMC offers the AT4, an off-road-focused model that allows owners to travel the path less taken. The AT4 adds an Autotrac two-speed transfer case, off-road suspension, twin-tube Rancho shocks, skid plates, a spray-in bedliner, and all-terrain tires for added off-road capability. It also benefits from a set of ventilated front bucket seats, heated rear outboard seats, a front center console, and premium front and rear floor liners with removable carpet inserts. 

Select configuration:
Starting Price (MSRP)
6.6L V8 Gas
10-Speed Automatic
Four-Wheel Drive
Body Type
Seating capacity
5 seater
Trunk Volume
Fuel Economy
City: TBC
Hwy: TBC

Performance Specs

Engine and Transmission

  • Engine
    6.6L V8 Gas
    6.6L Turbo V8 Diesel (+$9,490)
  • Horsepower
    401 hp @ 5200 rpm
  • Torque
    464 lb-ft @ 4000 rpm
  • Transmission
    10-Speed Automatic
  • Drivetrain
    Four-Wheel Drive


  • Steering Type
    Pwr Recirculating Ball
  • Turning Diameter
    52.7 ft


  • Wheels Type
    Aluminum Wheels
  • Front Wheel Size
    20" x TBD
  • Rear Wheel Size
    20" x TBD


  • Front Tire
  • Rear Tire
  • Spare Tire

Fuel and MPG

Fuel Tank

  • Fuel Tank Capacity
    36 gallons

Dimensions and Measurement

Exterior Dimensions

  • Length
    250.75 in
  • Height
    79.82 in
  • Max Width
    81.85 in
  • Wheelbase
    159 in

Interior Space

  • Seating Capacity
    5 seater
  • Front Seat Leg Room
    44.53 in
  • Front Seat Headroom
    43.03 in
  • Front Seat Shoulder Room
    66.02 in
  • Front Seat Hip Room
    61.18 in
  • Rear Seat Leg Room
    43.4 in
  • Rear Seat Headroom
    40.12 in
  • Rear Seat Shoulder Room
    65.3 in
  • Rear Seat Hip Room
    60.24 in

Weight and Towing

  • Maximum Towing Capacity
    20,000 lbs

Cargo Box Dimensions

  • Box Length (Floor)
    82.2 in
  • Box Width (Floor)
    71.4 in
  • Box Width (Wheelhousings)
    51.85 in
  • Box Height (Area)
    21 in
  • Cargo Volume
    69.5 ft³

Colors and Materials

Standard Interior Materials

  • Jet Black with Kalahari accents, Perforated Front Leather seat trim

Features and Options


  • HD Radio
    Not Available
  • Bluetooth Connection
  • Hard Disk Drive Media Storage
    Not Available
  • Premium Sound System
  • Satellite Radio
  • Smart Device Integration
  • WiFi Hotspot
  • Auxiliary Audio Input
  • Entertainment System
    Not Available
  • MP3 Player

Interior Trim

  • Bucket Seats
    Not Available
  • Cloth Seats
    Not Available
  • Leather Seats
  • Leather Steering Wheel
    Not Available
  • Premium Synthetic Seats
    Not Available
  • Vinyl Seats
    Not Available
  • Woodgrain Interior Trim
    Not Available
  • Sun/Moonroof


  • Head-Up Display
  • Navigation System
    Not Available
  • Steering Wheel Audio Controls
  • Power Liftgate
    Not Available
  • Power Mirror(s)
  • A/C
  • Adaptive Cruise Control
  • Automatic Parking
    Not Available
  • Climate Control
  • Cooled Front Seat(s)
  • Cooled Rear Seat(s)
    Not Available
  • Cruise Control
  • Hands-Free Liftgate
    Not Available
  • Heated Front Seat(s)
  • Heated Rear Seat(s)
  • Heated Steering Wheel
  • Keyless Entry
  • Multi-Zone A/C
  • Power Driver Seat
  • Power Passenger Seat
  • Remote Engine Start
  • Remote Trunk Release
    Not Available
  • Seat Memory
  • Universal Garage Door Opener
  • Seat-Massage
    Not Available
  • Rear A/C
    Not Available
  • Keyless Start
  • Navigation from Telematics
    Not Available
  • Telematics

Additional Packages

AT4 Preferred Equipment Group

includes standard equipment

AT4 Preferred Package


includes (UG1) Universal Home Remote, (A48) rear sliding power window, (U01) Roof Marker Lamps and (KSG) adaptive Cruise Control (Included with (PDG) AT4 Premium Plus Package. Note (U01) Roof Marker Lamps are not available with (YF5) California state emissions requirements.) AT4 Preferred Package Universal Home Remote Rear sliding power window LED roof marker lamps Adaptive Cruise Control1

AT4 Premium Plus Package


includes (PDO) AT4 Preferred Package, (CF5) power sunroof, (CWM) Technology Package and (VXW) AT4 high clearance step, LPO ((VXW) AT4 high clearance step can be substituted with (B3L) power-retractable, Black assist steps. Standard wheel can be optioned to (PXD) 18" wheel with (QG3) LT275/70R18, mud-terrain tire. Standard tire can be upgraded to (QFG) LT275/65R20 E 126/123 BF Goodrich off-road tires. Can be upgraded to (SHH) 20" High gloss Black painted wheels, LPO, (SQ9) 20" Machined Aluminum Bolt Pattern with High Gloss Black Accents wheels, LPO, (SAK) 22" High gloss black aluminum wheels with machined accents, LPO, (SBL) 22" Gloss black aluminum wheels, LPO or (SKX) 20" high gloss Black aluminum wheels with machined accents, LPO.) *GROSS* AT4 Premium Plus Package AT4 Preferred Package Power sunroof Technology Package AT4 high clearance step May require additional optional equipment

Heavy Duty Front Spring/Camper Package


Note: If ordered for Camper usage, recommend ordering (UY2) Trailering wiring provisions (Not available with (VYU) Snow Plow Prep/Camper Package.) Heavy Duty Front Spring / Camper Package

LPO, Cargo Convenience Package


includes (S1O) Console-Mounted Safe, LPO and (VBJ) rear under seat storage, LPO, (dealer-installed) Cargo Convenience Package Rear under seat storage Console-Mounted Safe May require additional optional equipment

LPO, Hitch Package


Gooseneck ball and chain tiedown kit with case, (dealer-installed) (Requires (Z6A) Gooseneck / 5th Wheel Prep Package.) Gooseneck Hitch Package Gooseneck ball Chain tiedown kit with case May require additional optional equipment

Max Trailering Package


includes 3500 HD Frame, 3500 HD Leaf Springs, 12" Rear axle, 3500 HD Shock Package, and (Z6A) Gooseneck / 5th Wheel Prep provisions with bed stamped holes and caps (Requires (L5P) Duramax 6.6L Turbo-Diesel V8 engine, (JL1) Trailer Brake Controller and 18" or 20" wheels and Tires and (CGN) spray-on bedliner. Not available with T*20753 or T*20953 models, (C7A) Lowered GVWR, 10,000 lbs. (4536 kg) or (UY2) Trailering wiring provisions.) Max Trailering Package 3500 HD Frame 3500 HD Leaf Springs 12" Rear axle 3500 HD Shock Package Gooseneck / 5th Wheel Prep provisions Bed stamped holes with caps installed

Snow Plow Prep/Camper Package


includes (KW5) 220-amp alternator, includes increased front GAWR on Heavy Duty models, (NZZ) skid plates (transfer case and oil pan), pass through dash grommet hole and roof emergency light provisions. Contact GM Upfitter Integration at www.gmupfitter.com for plow installation details and assistance. Note: if ordered for Camper usage, recommend ordering (UY2) Trailering wiring provisions (Includes (KW5) 220-amp alternator and is upgradeable to (KHF) Dual alternators (220-amp primary, 170-amp auxiliary). Not available with (F60) Heavy Duty Front Spring/Camper Package.) Snow Plow Prep / Camper Package Power feed to accommodate a backup and roof emergency light1 A single 220-amp alternator Heavy-duty front springs Under body skid plates to help protect the transfer case from debris May require additional optional equipment

Technology Package


includes (DRZ) Rear Camera Mirror and (UV6) Multicolor 15" Diagonal Head-Up Display (Requires (PDO) AT4 Preferred Package. Included with (PDG) AT4 Premium Plus Package.) Technology Package Rear Camera Mirror1 Multi-color 15" Diagonal Head-Up Display1 Adaptive Cruise Control1 on Denali AT4 Preferred Package on AT4 May require additional optional equipment


Safety Features

  • Back-Up Camera
  • Cross-Traffic Alert
  • Rear Parking Aid
  • Blind Spot Monitor
  • Lane Departure Warning
  • Lane Keeping Assist
    Not Available
  • ABS
  • Night Vision
    Not Available
  • Tire Pressure Monitor
  • Brake Assist
    Not Available
  • Stability Control
  • Traction Control


  • Driver Air Bag
  • Front Head Air Bag
  • Front Side Air Bag
  • Knee Air Bag
    Not Available
  • Passenger Air Bag
  • Rear Head Air Bag
  • Rear Side Air Bag
    Not Available
  • Seatbelt Air Bag
    Not Available


Warranty Summary

  • Basic
    3 Years / 36,000 Miles
  • Corrosion
    3 Years / 36,000 Miles
  • Drivetrain Note
    3.0L & 6.0L Duramax® Turbo-Diesel engines, and certain commercial, government, and qualified fleet vehicles: 5 years/100,000 miles
  • Drivetrain
    5 Years / 60,000 Miles
  • Maintenance Note
    First Visit: 12 Months/12,000 Miles
  • Roadside Assistance Note
    3.0L & 6.0L Duramax® Turbo-Diesel engines, and certain commercial, government, and qualified fleet vehicles: 5 years/100,000 miles
  • Roadside Assistance
    5 Years / 60,000 Miles
  • Rust-Through
    6 Years / 100,000 Miles
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