Used 2021 GMC Sierra 3500HD SLE

* Based on opinions and should be considered as general guidance only.

• Reliability (4)
  4 out of 5 stars
  GMC heavy-duty trucks generally have a strong reputation for reliability, and the 2021 Sierra 3500HD SLE is expected to follow suit. The powertrain options are proven, and the build quality feels robust, suggesting it will withstand demanding use over time.
• Maintenance (3)
  3 out of 5 stars
  Maintenance costs are typical for a heavy-duty truck. Parts and labor can be more expensive than for a passenger car, especially for specialized components. However, the robust design means routine maintenance intervals are reasonable, and major issues are uncommon if properly cared for.
• Technology (3)
  3 out of 5 stars
  The technology in the SLE is adequate for most users, featuring a user-friendly infotainment system with Apple CarPlay and Android Auto. However, it doesn't boast the cutting-edge features or large screens found in more luxurious or newer competitors. It's practical and functional without being flashy.
• Comfort (3)
  3 out of 5 stars
  The SLE trim provides a functional and reasonably comfortable interior. The seats are supportive for long hauls, though they lack the premium feel of higher trims. Road noise is present but not excessive for a truck of this size. It's built for work, and the comfort reflects that.
• Dynamics (4)
  4 out of 5 stars
  For a heavy-duty truck, the 2021 GMC Sierra 3500HD SLE offers surprisingly composed handling. It's not nimble, but it feels stable and confident, especially when towing heavy loads. The steering is appropriately weighted, and the ride, while firm, is tolerable for its class.