GM’s Heavy Duty trucks bring segment firsts. Here’s what’s changed

Posted by Talbot Payne on September 24, 2026

2027 Chevy Silverado Heavy Duty

2027 Chevy Silverado Heavy Duty

Henry Payne, The Detroit News

The diesel headliner is part of a comprehensive overhaul that includes a 6.6-liter V-8 engine upgrade, rack-and-pinion electronic power steering and eBoost braking

“It changes dramatically the driving experience in these vehicles,” continued Morris. “The diesel is the first we have designed, developed and manufactured completely in-house. It’s the most capable, durable and relentless diesel powerhouse we have ever built.”

The HD reveal comes just days after significant, mid-design cycle powertrain, exterior and interior upgrades to GM’s Chevrolet Silverado and GMC Sierra 1500 light duty trucks. Light duties now offer 5.7-liter V-8 (up from 5.3) and 6.6-liter V-8 variants (up from 6.2) for the 2027 model year.

HD upgrades are limited to the driveline, with no changes in exterior and interior design.

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