Summary

• With 38 currently listed for sale near Phoenix, AZ and an average price of $88,969.00, 18.4% of 2018 GMC Sierra 3500HDs for sale on CarGurus are rated as good or great deals.

• Favorably reviewed: Owners rated the 2018 GMC Sierra 3500HD 3 / 5 stars.

• 71.1% of 2018 Sierra 3500HD models on CarGurus are accident free.

Why it stands out

The 2018 GMC Sierra 3500HD stands out as a heavy-duty truck that still leans hard into work-truck capability while offering enough refinement to appeal to buyers who want more than just brute strength. In this generation, the Sierra 3500HD had already been updated with a more modern cabin than earlier versions, and by 2018 it came standard with a rearview camera. The infotainment update also trickled down to supporting trims, and the Denali trim gained a more stylish grille, giving the truck a more polished look without losing its rugged identity.

What makes the 2018 model especially distinctive is the breadth of its capability and configuration choices. It was offered with regular, extended, or crew cab body styles, a short or long bed, and single- or dual-rear-wheel setups. Two engines were available: a 6.0-liter gasoline V8 with 360 horsepower and 380 pound-feet of torque, and a turbocharged 6.6-liter diesel V8 with 397 hp and 765 lb-ft of torque. Properly equipped, it could haul as much as 7,374 pounds of payload and tow up to 19,600 pounds with a standard ball hitch, or 23,200 pounds with a fifth-wheel hitch. Those numbers make clear why the Sierra 3500HD has long been marketed as a commercial-grade workhorse.

The 2018 Sierra 3500HD also offered a wide spread of trims, from the basic Work Truck to the upscale Denali. Even the lower trims included useful equipment such as an eight-inch infotainment touchscreen, Wi-Fi hotspot capability, Bluetooth, OnStar telematics, and a rearview camera, while the SLT and Denali added features like leather upholstery, heated front seats, navigation, a Bose audio system, and parking sensors. Its main drawbacks were the same ones that come with most heavy-duty pickups: it could be unwieldy in tight spaces, and its rivals typically could tow more. Still, for buyers who want a truck that combines serious towing and hauling ability with a more refined interior than older heavy-duty pickups, the 2018 Sierra 3500HD has a lot to offer.

Other model years to consider

• 2025 GMC Sierra 3500HD

  • Average price: $75,597.00
  • Good/great deal percentage: 8.2%
  • User rating: 5 / 5
  • Total listings: 158

• 2023 GMC Sierra 3500HD

  • Average price: $43,800.00
  • Good/great deal percentage: 20.3%
  • Total listings: 123

• 2024 GMC Sierra 3500HD

  • Average price: $79,551.00
  • Good/great deal percentage: 14.4%
  • User rating: 5 / 5
  • Total listings: 139

This analysis is based on CarGurus' proprietary market data from August 11, 2026, CarGurus experts' opinions, and generative AI.