Mildenberger Motors

1717 N First Street Hamilton, MT 59840

2021 GMC Sierra 3500 OVERVIEW Overview Icon

2021 GMC Sierra 3500 in Hamilton

  • 6.6L gas V8 engine with 6-speed automatic transmission
  • StabiliTrak® with Traction Control
  • 12 total cargo tie-downs, rated at 500 lbs per corner
  • Available Front and Rear Park Assist, Lane Change Alert with Side Blind Zone Alert and Rear Cross Traffic Alert
2021 GMC Sierra 3500 Main Img

2021 GMC Sierra 3500 MODELS

  • Sierra 3500 Sierra

    Sierra 3500 Sierra

  • Sierra 3500 SLE

    Sierra 3500 SLE

  • Sierra 3500 SLT

    Sierra 3500 SLT

  • Sierra 3500 Sierra Dual Rear Wheel

    Sierra 3500 Sierra Dual Rear Wheel

  • Sierra 3500 SLE Dual Rear Wheel

    Sierra 3500 SLE Dual Rear Wheel

  • Sierra 3500 SLT Dual Rear Wheel

    Sierra 3500 SLT Dual Rear Wheel

  • Sierra 3500 AT4

    Sierra 3500 AT4

  • Sierra 3500 Single Rear Wheel Denali

    Sierra 3500 Single Rear Wheel Denali

  • Sierra 3500 Dual Rear Wheel Denali

    Sierra 3500 Dual Rear Wheel Denali

2021 GMC Sierra 3500 CONFIGURATIONS

* Model and trim configurations may vary
  • Sierra 3500 Regular Cab Long Bed
    Sierra 3500 Regular Cab Long Bed
  • Sierra 3500 Double Cab Long Bed
    Sierra 3500 Double Cab Long Bed
  • Sierra 3500 Crew Cab Standard Bed
    Sierra 3500 Crew Cab Standard Bed
  • Sierra 3500 Crew Cab Long Bed
    Sierra 3500 Crew Cab Long Bed

GMC Sierra 3500 Dealer in Hamilton

2021 GMC Sierra 3500 PERFORMANCE Performance Icon

2021 GMC Sierra 3500 performance

OPTIMAL ENGINE PERFORMANCE

To help maintain optimal operating temperatures of the available 6.6L Duramax® Turbo Diesel V8 engine, a massive 28" variable-speed cooling fan was added. Dense, cool air from the Dual Path Air Induction System is drawn through both the hood scoop and the large grille to maximize horsepower and help optimize trailering performance. The factory-installed Diesel After-Run feature is designed to help cool down the engine following heavy usage.

2021 GMC Sierra 3500 performance

AVAILABLE AUTO ELECTRIC PARKING BRAKE

To help with positioning, after backing up to a trailer hitch using available Hitch View, Sierra Heavy Duty will automatically apply the electric parking brake upon shifting into park to avoid unintentional rolling.

2021 GMC Sierra 3500 performance

PARK GRADE HOLD ASSIST

Prevents movement when shifting out of park on a hill and moving a foot from brake to accelerator pedal by automatically applying brakes at each wheel for an extended period of time while trailering.

2021 GMC Sierra 3500 APPEARANCE Appearance Icon

2021 GMC Sierra 3500 Appearance Main Img
2021 GMC Sierra 3500 appearance

TRAILERING MIRRORS

  • All Sierra Heavy Duty models are equipped with trailering mirrors
  • Sierra HD offers available trailering mirrors that power fold or manually extend and retract, LED rear guidance lamps that help enhance visibility when backing up with a trailer, lower convex mirrors, as well as amber auxiliary clearance lamps
  • Power-adjustable trailering mirrors power extend, fold and retract at the touch of a button. Available features include:
    • Heated and auto-dimming upper glass (driver and passenger)
    • LED turn-signal indicators/clearance lamps
    • LED perimeter lighting
    • LED forward auxiliary task lighting
2021 GMC Sierra 3500 appearance

SIDE BED STEP

The standard 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.

2021 GMC Sierra 3500 appearance

DUAL PATH AIR INDUCTION SYSTEM

The available 6.6L Duramax® Turbo-Diesel engine includes the Dual Path Air Induction System, which draws dense, cool air through both the hood scoop and the large front grille to provide cooler induction air temperatures to maximize horsepower and help optimize trailering performance.

2021 GMC Sierra 3500 COMFORT Comfort Icon

2021 GMC Sierra 3500 comfort

CORNERSTEP REAR BUMPER

In both corners of the rear bumper, large footwells, lined with an anti-slip texture and sized for large boots, helps make access to the cargo bed easier than ever. Standard on all Heavy-Duty models.

2021 GMC Sierra 3500 comfort

PREMIUM REAR SEAT COMFORT

Backseat passengers are sure to be comfortable with the available heated rear outboard seats and spacious rear leg room on Crew Cab models.

2021 GMC Sierra 3500 comfort

SPACIOUS CENTER CONSOLE

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

2021 GMC Sierra 3500 comfort

AVAILABLE WIRELESS CHARGING

When on the road in the Sierra Heavy Duty, it’s OK to leave the cords at home. The wireless charging pad, located within easy reach near the cup holders, has excellent charging abilities and keeps your compatible smartphone charged and ready.

2021 GMC Sierra 3500 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
2021 GMC Sierra 3500 Safety Main Img
2021 GMC Sierra 3500 safety

AVAILABLE REAR CROSS TRAFFIC ALERT

Rear Cross Traffic Alert can alert you to detected left- or right-cross traffic behind you when in Reverse. Available on Sierra HD, SLE, SLT, and AT4. Standard on Denali.

2021 GMC Sierra 3500 safety

AVAILABLE FORWARD COLLISION ALERT

Forward Collision Alert can warn you if it detects a potential front-end collision with a vehicle you're following so you can quickly take action. The system can also provide a tailgating alert if you are following a vehicle much too closely. Available on base Sierra HD, SLE, SLT and AT4. Standard on Denali.

2021 GMC Sierra 3500 safety

AVAILABLE FOLLOWING DISTANCE INDICATOR

Following Distance Indicator displays the gap time in seconds between your vehicle and a detected vehicle you’re following. This can help you decide if you are following much too closely. Available on base Sierra HD, SLE, SLT and AT4. Standard on Denali.

2021 GMC Sierra 3500 safety

AVAILABLE INTELLIBEAM®

When driving conditions are dark, available IntelliBeam auto high beams can automatically turn the vehicle’s high-beam headlamps on and off according to surrounding traffic conditions. Available on SLE, SLT and AT4. Standard on Denali.

We're sorry, but we do not have a 2021 GMC Sierra 3500 in our current inventory.

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