---
id: what-engine-options-are-available-in-the-2026-gmc-sierra-hd
title: "What engine options are available in the 2026 GMC Sierra HD?"
category: guide
subtopic: sierra-hd-engines
page_type: guide
source_url: "https://www.markquartmotors.com/research/gmc/sierra-hd.htm"
tags: ["GMC", "Sierra HD", "engines", "Duramax", "diesel", "V8"]
questions:
  - "What engines are in the Sierra HD?"
  - "Does the Sierra HD have a diesel option?"
  - "How much horsepower and torque 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 to match your hauling and work demands.

The standard 6.6L V8 gas engine pairs with a 10-speed automatic transmission for smooth, predictable power ideal for daily hauling and jobsite use.

For maximum capability, the available Duramax 6.6L Turbo-Diesel V8 produces an impressive 470 horsepower and 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 major advantage for long hauls.

Both engines deliver the authority and control the Sierra HD is built for. Your choice depends on your specific towing frequency, load types, and operational needs.

Curious which engine fits your situation best? Call Markquart Motors at (715) 833-0444 to discuss your options with our sales team, or browse our available 2026 GMC Sierra HD inventory today.