THE ‘ULTIMATE’ HEAVY DUTY
GMC Introduces a Luxurious, Advanced, and Capable Sierra HD
LED by the first-ever Sierra Heavy Duty Denali Ultimate, the 2024 model year takes the Sierra HD lineup to new heights with what GMC describes as premium luxury and comfort, turbocharged pulling power, and elevated technology—which the company says offers the most trailering assistance technology in its class.
The 2024 Sierra HD lineup includes 2500HD and 3500HD models, in Regular Cab, Extended Cab, and Crew Cab configurations—with dual-rear-wheel models available on 3500HD. They support the lineup’s highest trailering capacity: up to 36,000 pounds. Available trims include Pro, SLE, SLT, AT4, Denali, and Denali Ultimate, with the AT4X trim coming later in the model year.
The available enhanced 6.6L Duramax Turbo-Diesel, paired with the 10-speed Allison transmission, now…
