2021 GMC Sierra 3500HD

The Sierra 3500 HD delivers a bold looking exterior with very capable payload and towing values. The GMC Sierra is offered in both 4x2 and 4x4 models with either a single rear wheel (SRW) or a dual rear wheel (DRW) configuration as well as a wide array of trims and class exclusive features and options. The Sierra HD comes in one of several different body styles with long and short bed options. However, despite this complexity there are only two available engines, both V8 units displacing 6.6 liters. The gasoline option is paired to a 6-speed automatic and makes 401 …
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