2021 GMC Sierra 3500HD Trim Levels | Heavy Duty Truck: What Are The Differences?

Bring absolute command and control to your toughest towing tasks with the 2021 GMC Sierra 3500HD. And because it’s a GMC, you’ll also find hard working innovations, intelligent upgrades in trailering tech like the industry-first available transparent trailer view, and the spacious comfort you’d expect in the heavy duty version of Professional Grade. The 2021 Sierra 3500HD is available in five trim levels — the Sierra 3500HD base, SLE, SLT, AT4, and Denali. Learn which 2021 Sierra 3500HD trim fits your vision of a powerful trucking experience by using the following research guide created by the team at Buick GMC of Rochester.

Shop the 2021 Sierra 3500HD inventory at our Rochester, MN, dealership. Be sure to schedule a test drive, then take advantage of our current GMC offers. Contact the Buick GMC of Rochester sales team online or at (507) 288-1811 with any questions.

GMC Sierra 3500hd towing transformers through mountains

2021 GMC Sierra 3500HD Trims

Whether you choose the base Sierra 3500HD, off-road ready AT4, or ascend to the pinnacle of Professional Grade with the Denali trim, find your ideal heavy duty GMC truck in the list of trims below.

Select a Trim

GMC Sierra 3500hd Base in black exterior

2021 GMC Sierra 3500HD Base

MSRP: Starting at $37,495


Key Features:

  • Starting MSRP: $37,495
  • 6.6L gas V8
  • Available 6.6L Duramax® turbo diesel V8
  • Black recovery hooks
  • 17-in. steel silver painted wheels
  • Trailering mirrors
  • Cab-mounted cargo area lamps
  • LED daytime running lamps, tail lamps
  • 40/20/40 split front bench seat 
  • Four-way manual front seats
  • GMC Infotainment System 
  • 7-in. color touchscreen
  • Apple CarPlay® and Android Auto™
  • Rear vision camera 
  • Hitch guidance
  • Vinyl seat trim 
  • Rubberized vinyl floor covering 
  • Available Gooseneck / 5th Wheel Package
  • Available Heavy Duty Front Spring / Camper Package


GMC Sierra 3500HD in red exterior SLE

2021 GMC Sierra 3500HD SLE

MSRP: Starting at $42,595


Includes or replaces Sierra 3500HD base features, plus:

  • Integrated trailer brake controller
  • 17-in. aluminum wheels
  • Power adjustable trailering mirrors
  • GMC MultiPro tailgate
  • 4G LTE Wi-Fi® hotspot
  • SiriusXM® Satellite Radio
  • 8-in. color touchscreen
  • Cloth seat trim 
  • Carpeted floor coverings
  • Leather-wrapped steering wheel
  • Available Driver Alert Packages I and II
  • Available GMC Protection Package
  • Available Preferred Package
  • Available ProGrade Trailering System


GMC Sierra 3500HD SLT exterior

2021 GMC Sierra 3500HD SLT

MSRP: Starting at $52,595


Includes or replaces Sierra 3500HD SLE features, plus:

  • Digital variable steering assist
  • In-vehicle trailering app
  • 18-in. machined aluminum wheels with Dark Grey metallic accents
  • LED lighting
    • Cargo bed 
    • Fog lamps
    • Reflector headlamps
  • Power folding/extending trailering mirrors
  • Standard ProGrade Trailering System
  • Perforated leather appointed, heated, ten-way power front seats with memory
  • Heated steering wheel
  • 120V box-mounted power outlet and 120V power outlet in cab
  • Premium GMC Infotainment System
  • Dual-zone climate control
  • HD Radio™
  • HD rear vision camera
  • Wireless phone projection
  • Hitch guidance with hitch view
  • Available Texas Edition SLT Premium Package
  • Available X31 Off-Road and Protection Package


GMC Sierra 3500HD AT4 in black exterior

2021 GMC Sierra 3500HD AT4

MSRP: Starting at $59,995


Includes or replaces Sierra 3500HD SLT features, plus:

  • 4WD
  • Hill descent control
  • Off-road suspension
  • Skid plates
  • Red vertical recovery hooks
  • Spray-on bedliner
  • Ventilated front bucket seats 
  • Heated rear outboard seats
  • Premium floor liners
  • Available AT4 Preferred Package
  • Available AT4 Premium Plus Package
  • Available Technology Package


GMC Sierra 3500HD in green exterior Denali trim

2021 GMC Sierra 3500HD Denali

MSRP: Starting at $66,495


Builds on some AT4 features with:

  • 20-in. polished aluminum wheels
  • 6-in. chrome rectangular assist steps
  • Chrome recovery hooks
  • Smoked amber LED roof marker lamps
  • Navigation system
  • Bed view camera
  • Bose® premium sound system
  • HD surround vision
  • Power sliding rear window with defogger
  • Forge perforated leather seat trim
  • Wireless device charging
  • Standard Driver Alert Packages I and II
  • Available Black Diamond Edition
  • Available Denali Ultimate Package


Engine Options & Specs

How much heavy duty power do you need? The properly equipped 6.6L gas V8 gives you up to 7,442 pounds of maximum payload capacity. But the properly equipped 6.6L Duramax V8 gives you up to 36,000 pounds of maximum towing. Use the table below to decide which engine you want with your 2021 GMC Sierra 3500HD base, SLE, SLT, AT4, or Denali.

6.6L V8 gasoline Engine 6.6L Duramax turbo diesel V8
Six-speed automatic Transmission Allison® ten-speed automatic
401 HP Horsepower 445 HP
464 lb.-ft. Torque 910 lb.-ft.

GMC Sierra 3500HD driving along grassy road

Cab & Bed Configurations

Step into best-in-class crew cab front head and leg room, or best-in-class heavy duty cargo bed volume with one of the following 2021 GMC Sierra 3500 HD cab and bed configurations.

  • Crew Cab, Standard Bed
  • Crew Cab, Long Bed
  • Double Cab, Long Bed
  • Regular Cab, Long Bed
  • Long Bed models available with single rear wheel or dual rear wheel configurations

2021 GMC Sierra 3500HD Inventory for Sale near Me

Find the 2021 GMC Sierra 3500HD for sale in Rochester, MN, by browsing the inventory at Buick GMC of Rochester. Be sure to schedule a test drive and reach out to our team of GMC experts online or at (507) 288-1811 with any questions.

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