Here's a list of official specs for the 2024 GMC Sierra HD AT4X & AT4X AEV Edition.

2024 GMC SIERRA HD AT4X & AT4X AEV EDITION SPECIFICATIONS

CONFIGURATION

2500HDCrew Cab Standard Bed (4WD)


ENGINES

Type:6.6L V-8 gasoline or E85 FlexFuel
Bore & Stroke (in. / mm):4.06 x 3.86 / 103.25 x 98
Block Material:Cast iron with nodular iron main caps
Cylinder Head Material:Cast aluminum
Compression Ratio:10.8:1
Valvetrain:Overhead-valve, two valves per cylinder, variable valve timing
Fuel Delivery:Direct fuel injection
Horsepower (hp / kW @ rpm):401 / 299 @ 5200 (SAE certified – gasoline)
Torque (lb.-ft. / Nm @ rpm):464 / 629 @ 4000 (SAE certified – gasoline)
Type:Duramax 6.6L V-8 Turbo-Diesel
Bore & Stroke (in. / mm):4.05 x 3.89 / 103 x 99
Block Material:Cast iron
Cylinder Head Material:Cast aluminum
Compression Ratio:16.0:1
Valvetrain:Overhead-valve, four valves per cylinder
Fuel Delivery:Common-rail direct fuel injection
Horsepower (hp / kW @ rpm):470 / 350 @ 2800 (per SAE J1349)
Torque (lb.-ft. / Nm @ rpm):975 / 1322 @ 1600 (per SAE J1349)


TRANSMISSION & AXLE

Type:Allison® 10L1000 10-speed automatic
Gear Ratios :)1):
First4.54
Second2.87
Third2.06
Fourth1.72
Fifth1.48
Sixth1.26
Seventh1.00
Eighth0.85
Ninth0.69
Tenth0.63
Reverse4.54
Final Drive Ratio:3.73 (6.6L gas)
3.42 (6.6L diesel)


CHASSIS & SUSPENSION

Front Suspension:Independent front suspension with torsion bars
Rear Suspension:Semi-elliptic, two-stage, multi-lead springs
Steering Type:Hydraulic power-assisted recirculating ball
Brake Type:Hydraulic power-assisted Hydroboost brake booster, four-wheel disc brakes with ABS and Stabilitrak electronic stability assist
Brake Rotor Size (in. / mm):Front: 14 x 1.6 / 355 x 40
Rear: 14.1 x 1.3 / 360 x 34
Wheel Size:18 x 9-in. aluminum
Tire Size:LT305/70R18 MT


FUEL TANK CAPACITY (approx.)

Fuel Tank (gal. / L):36 / 136 (gas and diesel)


EXTERIOR DIMENSIONS

Wheelbase (in. / mm):159.1 / 4042
Overall Length (in. / mm):250.7 / 6369 (AT4X)
252 / 6401 (AT4X AEV Edition)
Overall Width (in. / mm):81.9 / 2079 (without mirrors)
105.1 / 2670 (with mirrors extended)
Overall Height (in. / mm):82.6 / 2100
Front Track (in. / mm):69.3 / 1762
Rear Track (in. / mm):70.0 / 1760
Ground Clearance (in. / mm):11.6 / 295 (AT4X)
11.7 / 299 (AT4X AEV Edition)
Approach Angle (deg.):31.6 (AT4X)
29.8 (AT4X AEV Edition)
Departure Angle (deg.):25.7 (AT4X & AT4X AEV Edition)
Breakover Angle (deg.):21.2 (AT4X)
22.6 (AT4X AEV Edition)


INTERIOR DIMENSIONS

Headroom (in. / mm):43.03 / 1093 (front)
40.12 / 1019 (rear)
Legroom (in. / mm):44.53 / 1131 (front)
43.4 / 1102 (rear)
Shoulder Room (in. / mm):66.02 / 1677 (front)
65.3 / 1659 (rear)
Hip Room (in. / mm):61.18 / 1554 (front)
60.24 / 1530 (rear)


CURB WEIGHT, GVWR & PAYLOAD1

Base Curb Weight (lb. / kg):7516 / 3409 – AT4X gas
8237 / 3736 – AT4X diesel
7894 / 3581 – AT4X AEV Edition gas
8605 / 3903 – AT4X AEV Edition diesel
GVWR (lb. / kg):10850 / 4921 – AT4X gas
11350 / 5148 – AT4X diesel
10850 / 4921 – AT4X AEV Edition gas
11350 / 5148 – AT4X AEV Edition diesel
Payload1 (lb. / kg):3291 / 1493 – AT4X gas
3068 / 1392 – AT4X diesel
2912 / 1321 – AT4X AEV Edition gas
2701 / 1225 – AT4X AEV Edition diesel
1For comparison purposes only. See the owner's manual and the label on the vehicle door jamb for the carrying capacity of a specific vehicle.

MAX TRAILERING1

Conventional (lb. / kg):16000 / 7257 – AT4X gas
18500 / 8391 – AT4X diesel
16000 / 7257 – AT4X AEV Edition gas
18400 / 8346 – AT4X AEV Edition diesel
Fifth-Wheel/Gooseneck
(lb. / kg):		18000 / 8165 – AT4X gas
17300 / 7847 – AT4X diesel
16200 / 7348 – AT4X AEV Edition gas
14800 / 6713 – AT4X AEV Edition diesel
1Before you buy a vehicle or use it for trailering, carefully review the Trailering section of the Owner’s Manual.

NOTE: All towing capabilities measured using SAE J2807 metrics.