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2024 GMC Sierra 2500HD AT4X (6.6L Gas)

The 2024 GMC Sierra 2500HD AT4X (6.6L Gas) is a 401-hp 6.6-liter with an allison 10l1000 10-speed automatic and four-wheel drive.

Spec Value
Engine
Engine Type6.6L V-8 gasoline / E85 FlexFuel; cast iron block with nodular iron main caps; cast aluminum heads
Displacement6.6 L
Horsepower401 hp
Torque464 lb-ft
ValvetrainOverhead-valve, 2 valves per cylinder, variable valve timing
Bore and Stroke103.25 x 98
Compression Ratio10.8:1
Injection TypeDirect fuel injection
Drivetrain
Drive Type4WD
Transmission
TransmissionAllison 10L1000 10-Speed Automatic
1st Gear4.54
2nd Gear2.87
3rd Gear2.06
4th Gear1.72
5th Gear1.48
6th Gear1.26
7th Gear1
8th Gear0.85
9th Gear0.69
10th Gear0.63
Reverse4.54
Final Drive3.73
Fuel Economy
Recommended FuelRegular Unleaded / E85 FlexFuel
Suspension
Front SuspensionIndependent front suspension with torsion bars; 1.5-in factory-installed lift
Rear SuspensionSemi-elliptic, two-stage, multi-leaf springs; 1.5-in factory-installed lift; Multimatic DSSV dampers
Brakes
Front Brake Disc14.0 x 1.6 in / 355 x 40 mm ventilated disc
Rear Brake Disc14.1 x 1.3 in / 360 x 34 mm ventilated disc
Tires & Wheels
Wheels Front18 x 9 in aluminum
Wheels Rear18 x 9 in aluminum
Tires FrontLT305/70R18 MT
Tires RearLT305/70R18 MT
Dimensions & Weight
Length250.7 in
Width81.9 in
Height82.6 in
Wheelbase159.1 in
Front Track69.3 in
Rear Track70 in
Ground Clearance11.6 in
Approach Angle31.6°
Departure Angle25.7°
Curb Weight7,516 lbs
Interior
Headroom Front43.03 in
Headroom Rear40.12 in
Legroom Front44.53 in
Legroom Rear43.4 in
Shoulder Room Front66.02 in
Shoulder Room Rear65.3 in
Hip Room Front61.18 in
Hip Room Rear60.24 in
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