* Based on opinions and should be considered as general guidance only.
- Reliability (4)GMC heavy-duty trucks generally have a strong reputation for reliability, especially with their powertrains. Owners can expect a durable workhorse that holds up well over time with proper care.
- Maintenance (3)Maintenance costs can be higher than average due to the specialized components and larger fluid capacities of a heavy-duty truck. Parts can also be more expensive, but routine service intervals are standard.
- Technology (4)The infotainment system is intuitive and features a large touchscreen with wireless Apple CarPlay and Android Auto. Advanced driver-assistance systems are available, enhancing safety and convenience.
- Comfort (4)The cabin is spacious and well-appointed, offering a comfortable ride even on longer journeys. The AT4's specialized suspension does a good job of absorbing road imperfections, and the seats are supportive.
- Dynamics (4)For a heavy-duty truck, the Sierra 3500HD AT4 handles surprisingly well, especially considering its size and off-road capabilities. Steering is responsive for its class, and body roll is managed effectively.