---
id: what-engine-options-does-the-2026-gmc-sierra-hd-have
title: "What engine options does the 2026 GMC Sierra HD have?"
category: faq
subtopic: sierra-hd-engines
page_type: faq
source_url: "https://www.markquartmotors.com/research/gmc/sierra-hd.htm"
tags: ["GMC", "Sierra HD", "engines", "diesel", "gas"]
questions:
  - "What engines are in the Sierra HD?"
  - "Is there a diesel option for the Sierra HD?"
  - "How much horsepower does the Sierra HD have?"
  - "What's the difference between the gas and diesel engines?"
related: [sierra-hd-overview, sierra-hd-towing]
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 transmission for smooth, predictable power suited to daily hauling and jobsite work.

For maximum capability, the available Duramax 6.6L Turbo-Diesel V8 produces 470 horsepower and an industry-leading 975 lb-ft of torque. This diesel powertrain includes an integrated exhaust brake that enhances downhill control and reduces brake wear when towing heavy loads-a real advantage if you're regularly pulling substantial trailers.

Both engines deliver the authority and control you need under pressure. To compare specs, see current pricing, and test drive either configuration, call Markquart Motors at (715) 833-0444 or visit us in Chippewa Falls, WI.