2021 GMC Sierra 3500HD Reviews, Pricing & Specs
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GMC’s heavy-duty Sierra is essentially unchanged for 2021.
The 2021 GMC Sierra 3500 HD is available in five trim levels: Pro, SLE, SLT, AT4, and Denali.
The Sierra 3500 HD is standard with rear-wheel drive, with optional four-wheel drive. Trims are also available in single- or dual-rear wheel configurations, with the exception of the AT4, which is only available in single-wheel form. The 3500 HD is also available in several cab and bed configurations, including Regular Cab Long Bed, Double Cab Long Bed, Crew Cab Standard Bed and Crew Cab Long Bed. The AT4 and Denali trims are exclusive to the two Crew Cab configurations.
The GMC Sierra 3500 HD lineup is powered by a standard 6.6-liter V8 gas engine, which provides 401 horsepower and 465 lb-ft of torque. That engine offers a maximum 7,442-pound payload capacity in the rear-drive, Regular Cab configuration with dual rear wheels, and 16,800 pounds of towing capacity with a Class IV hitch. With a gooseneck, that increases to 17,200 pounds. The gas engine utilizes a Hydra-Matic 6L90 transmission with six speeds.
GMC offers the 3500 HD with an optional 6.6-liter V-8 Duramax Turbo-Diesel, which provides 445 horsepower and 910 lb-ft of torque. That engine provides a maximum payload capacity of 6,523 pounds in the rear-drive Regular Cab, dual-rear-wheel configuration. Towing increases to a 20,000-pound maximum with the Regular Cab with dual rear wheels towing a conventional trailer. Max capacity increases to 36,000 pounds with a Regular Cab when dual towing a gooseneck trailer with a fifth wheel. The diesel engine requires the Allison 10L1000 10-speed automatic transmission.
Safety equipment includes a Rear View Camera on Pro and SLE trim levels, with HD View standard on the SLT and optional on SLE. HD Surround Vision with two trailer view camera provisions is standard on the Denali trim and available on both SLT and AT4.
All trims, with the exception of the Sierra 3500 HD Pro, include a standard MultiPro tailgate, GMC’s six-function tailgate that allows easier loading, unloading, and bed access The MultiPro tailgate is optional on the Pro trim.
Bluetooth functionality is standard on all 3500 HD trim levels, The Pro, SLE, and SLT trim levels include an AM/FM stereo with six speakers. The Pro and SLE trims have wired Apple CarPlay and Android Auto capability. The SLE, AT4 and Denali trims make Apple CarPlay and Android Auto wireless. Both the SLE and the AT4 are optional with a Bose audio system, while the Denali makes that system standard.
Lane Departure Warning is available on SLE, SLT, and AT4, and standard on Denali. Front and rear park assist are optional on all trims except Denali, which makes that feature standard. If the vehicle senses an impending collision, Safety Seat Alert vibrates to warn drivers. That feature is optional on SLT and AT4, and standard on Denali. IntelliBeam automatic headlamps are standard on Denali, and optional on SLE, SLT, and AT4.
The 2021 Sierra 3500 HD starts at $42,095 for the base Pro trim. The SLE trim starts at $50,195, SLT at $61,595, AT4 at $64,995, and Denali at $71,495.
