---
id: what-engines-are-available-in-the-2026-gmc-sierra-hd
title: "What engines are available in the 2026 GMC Sierra HD?"
category: faq
subtopic: sierra-hd-engines
page_type: faq
source_url: "https://www.markquartmotors.com/research/gmc/sierra-hd.htm"
tags: ["GMC", "Sierra HD", "powertrain", "diesel", "gas engine"]
questions:
  - "Does the Sierra HD have a diesel option?"
  - "What's the horsepower on the GMC Sierra HD?"
  - "Which engine is better for towing?"
related: [sierra-hd-towing, sierra-hd-performance]
dealer: Markquart Motors
---

The 2026 GMC Sierra HD offers two powerful engine choices. The standard 6.6L V8 gas engine pairs with a 10-speed automatic for smooth, reliable power suited to daily hauling. For maximum capability, the available Duramax 6.6L Turbo-Diesel V8 delivers 470 horsepower and an industry-leading 975 lb-ft of torque, plus an integrated exhaust brake that enhances downhill control and reduces brake wear during heavy towing.

Both powertrains are engineered for demanding work. To compare these engines in person and discuss which suits your workload best, visit Markquart Motors in Chippewa Falls or call (715) 833-0444 for more details.