2025 GMC Sierra
AT4X 4WD
What the AT4X adds over the Pro
| Spec | Pro | AT4X |
|---|---|---|
| Curb weight (maximum) | 4500 lbs | 5550 lbs |
| Curb weight (minimum) | 4410 lbs | 5250 lbs |
| Aspiration | twin turbo | naturally aspirated |
| Cylinder count | 4 | 8 |
| Engine displacement | 2700 cc | 6200 cc |
| Horsepower | 310 hp | 420 hp |
| Torque | 430 lb-ft | 460 lb-ft |
| Engine type (full description) | 2.7L Turbo DOHC VVT DI with Active Fuel Management | 6.2L V-8 VVT DI with Dynamic Fuel Management |
| Valve configuration | Dual-overhead camshafts, four-valves per cylinder | Overhead valve, two valves per cylinder |
| Fuel tank capacity | 28.3 gal | 24 gal |
| Ground clearance | 7.9 in | 10.9 in |
| Gross vehicle weight rating | 6800 lbs | 7100 lbs |
| Front headroom | 43.1 in | 43 in |
| MPG (city) | 19 mpg | 14 mpg |
| MPG (highway) | 22 mpg | 17 mpg |
| Overall height | 75.7 in | 78.2 in |
| Overall length | 210.9 in | 242.4 in |
| Overall width | 81.1 in | 81.2 in |
| Payload capacity | 2260 lbs | 1520 lbs |
| Front suspension type | Independent coil-over-shock with twin-tube shock absorbers | Independent coil-over-shock with Multimatic DSSV dampers |
| Rear suspension type | Solid axle with semi-elliptic, variable-rate, two-stage multileaf springs, splayed twin-tube shock absorbers | Solid axle with semi-elliptic, variable-rate, two-stage multileaf springs, Multimatic DSSV dampers |
| Tire size | P255/70R17 | LT265/60R20 |
| Transmission speeds | 8 | 10 |
| Wheel diameter | 17 in | 20 in |
| Wheel material | steel | Aluminum |
Standard here, not on the base trim: 3.0L DOHC I-6 Turbo-Diesel – 305 hp / 495 lb.-ft. torque, Multimatic DSSV dampers (AT4X), Trailer Brake Controller (standard on SLE trim and above)
Specifications
Source: manufacturer press kitBrakes
| Front brake diameter | 330 mm |
| Front brake type | Vented disc |
| Rear brake diameter | 345 mm |
| Rear brake type | Vented disc |
Dimensions Exterior
| Ground clearance | 10.9 in |
| Overall height | 78.2 in |
| Overall length | 242.4 in |
| Overall width | 81.2 in |
| Wheelbase | 157.1 in |
Engine Basics
| Aspiration | naturally aspirated |
| Cylinder count | 8 |
| Engine displacement | 6200 cc |
| Fuel injection system | gdi mpi |
| Engine type (full description) | 6.2L V-8 VVT DI with Dynamic Fuel Management |
| Valve configuration | Overhead valve, two valves per cylinder |
Engine Output
| Horsepower | 420 hp |
| Torque | 460 lb-ft |
Fuel Economy
| MPG (city) | 14 mpg |
| MPG (highway) | 17 mpg |
Fuel System
| Fuel tank capacity | 24 gal |
Headroom
| Front headroom | 43 in |
| Second-row headroom | 40.1 in |
Legroom
| Front legroom | 44.5 in |
| Second-row legroom | 43.4 in |
Shoulder Room
| Front shoulder room | 66 in |
| Second-row shoulder room | 65.1 in |
Steering
| Steering type | Electric power-assisted rack-and-pinion |
Suspension
| Front suspension type | Independent coil-over-shock with Multimatic DSSV dampers |
| Rear suspension type | Solid axle with semi-elliptic, variable-rate, two-stage multileaf springs, Multimatic DSSV dampers |
Tires
| Tire size | LT265/60R20 |
Transmission
| Final drive ratio | 3.4 |
| Transmission speeds | 10 |
| Transmission type | automatic |
Weights
| Curb weight (maximum) | 5550 lbs |
| Curb weight (minimum) | 5250 lbs |
| Gross vehicle weight rating | 7100 lbs |
| Payload capacity | 1520 lbs |
Wheels
| Wheel diameter | 20 in |
| Wheel material | Aluminum |
| Wheel width | 9 in |
Standard & optional equipment
Source: manufacturer press kitSafety2 std · 0 opt
- Cruise Control (standard on Pro trim)
- Four-wheel disc with electro-hydraulic power assist and ABS
Powertrain5 std · 2 opt
- 10-speed automatic transmission (3.0L, 5.3L and 6.2L)
- 2.7L Turbo DOHC VVT DI with Active Fuel Management – 310 hp / 430 lb.-ft. torque
- 3.0L DOHC I-6 Turbo-Diesel – 305 hp / 495 lb.-ft. torque
- 5.3L V-8 VVT DI with Dynamic Fuel Management – 355 hp / 383 lb.-ft. torque
- 8-speed automatic transmission (2.7L)
- 6.2L V-8 VVT DI with Dynamic Fuel Management – 420 hp / 460 lb.-ft. torque optional
- Two-speed transfer case or Autotrac automatic transfer case with 4WD (depending on model) optional
Chassis5 std · 0 opt
- Electric power-assisted rack-and-pinion steering
- Independent coil-over-shock front suspension with twin-tube shock absorbers; Rancho shocks on AT4; Multimatic DSSV dampers on AT4X; Adaptive Ride Control available on Denali
- Multimatic DSSV dampers (AT4X)
- Solid axle rear suspension with semi-elliptic, variable-rate, two-stage multileaf springs, splayed twin-tube shock absorbers; Rancho shocks on AT4; Multimatic DSSV dampers on AT4X; Adaptive Ride Control available on Denali
- Vented front and rear Duralife™ brake rotors (13 x 1.18 in. front / 13.6 x 0.79 in. rear)
Cargo1 std · 0 opt
- Trailer Brake Controller (standard on SLE trim and above)
Ranked by what shoppers ask about first; standard equipment before options.
Transcribed from the manufacturer's official press kit for the 2025 Sierra. Confirm with the window sticker for a specific unit.
The cheapest ownership win
Insurers price the 2025 Sierra very differently, and the gap between the best and worst quote on the same car and driver is usually larger than any option you are weighing on this page.
How to compare cover →Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.
Common questions about the AT4X
Source: EPA, NHTSA and manufacturer press kitsWhat does the 2025 GMC Sierra AT4X add over the Pro?
Against the Pro, 3 features become standard that the Pro does not and 27 published specifications differ. Both lists are on this page, taken from the manufacturer's own press material.