Sierra 2500HD AT4X 6.6 V8 L8T

T1XX · 2024–present4WDPickup

Off-road flagship added for 2024: 1.5-inch factory lift, Multimatic DSSV dampers, rear e-locking differential, 35-inch Goodyear Territory MT tires. Standard 6.6L gas V8; 6.6L Duramax optional. An AEV Edition package was offered on top.

396 hpPower

2024Year

Engineering passport

Specifications

Powertrain

Engineering details

Engine6.6 V8 (L8T)

Displacement6.6 L

Cylinders8

FuelPetrol

Transmission10-speed Allison Automatic

Drivetrain4WD

Performance

Numbers that matter

Power396 hp

Torque629 Nm

BodyPickup

STORY

Sierra HD is the collective name for GMC's heavy-duty pickup line, encompassing the 2500HD and 3500HD models built for higher towing and payload than the light-duty Sierra 1500. The current T1XX-based HD trucks, launched for 2020, are powered by the L5P 6.6L Duramax diesel with a 10-speed Allison or the 6.6L gasoline V8. They introduced the AT4 off-road trim, Denali luxury variant, and advanced camera-based trailering systems.

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