CAR.SPACE

AT4 T1XX

T1XX · 2020–20244WDPickup

The Sierra 2500HD AT4 is a four-door, six-seat four-wheel-drive pickup built from 2020 to 2024. Its 6.6-litre turbo-diesel V8 produces 470 PS and 975 Nm through an Allison 10-speed automatic gearbox.

464 hpPower
2020-2024Year
Engineering passport

Specifications

Powertrain
Engineering details
Engine6.6L turbo-diesel V8
Displacement6.6 L
Cylinders8
FuelDiesel
Transmission10-speed Allison Automatic
Drivetrain4WD
Performance
Numbers that matter
Power464 hp
Torque975 Nm
Fuel tank136 L
Dimensions & body
Length6370 mm
Width2078 mm
Height2024 mm
Wheelbase4039 mm
BodyPickup
Doors4
Seats6

STORY

The Sierra 2500HD is GMC's three-quarter-ton heavy-duty pickup, engineered for higher payload and towing than the half-ton Sierra 1500. It is offered with gasoline V8s and the Duramax turbo-diesel V8 paired to the Allison transmission, a combination prized for heavy trailering. The truck shares its heavy-duty architecture with the Chevrolet Silverado 2500HD.

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