2026 GMC Sierra 2500 HD | Every Trim Level Compared | Howard Bentley
TL;DR The 2026 GMC Sierra 2500 HD lineup spans eight trim levels—from the work-ready Pro to the ultra-luxury Denali Ultimate—all powered by a standard 6.6L V8 gas engine with an available 6.6L Duramax® Turbo-Diesel V8 producing 470 hp and 975 lb.-ft. of torque. Big changes for 2026 include mandatory 4WD on SLE and SLT trims,…