---
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: faq
subtopic: sierra-hd-engine-options
page_type: faq
source_url: "https://www.markquartmotors.com/research/gmc/sierra-hd.htm"
tags: ["GMC", "Sierra HD", "engine", "Duramax", "diesel"]
questions:
  - "What engines does the Sierra HD have?"
  - "Is there a diesel option for the Sierra HD?"
  - "6.6L engine specs for Sierra HD"
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 transmission for smooth, predictable power ideal for daily hauling and jobsite work. 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 when towing heavy loads. Both powertrains are engineered to handle demanding workloads with confidence. Contact Markquart Motors at (715) 833-0444 to discuss which engine option best suits your needs and schedule a test drive.