Independent coil-over-shock with twin-tube shock absorbers
Independent coil-over-shock with Rancho shock absorbers
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, splayed Rancho shock absorbers
Tire size
P255/70R17
LT275/65R18
Wheel diameter
17 in
18 in
Wheel material
steel
Aluminum
Wheel width
8 in
8.5 in
Wheelbase
126.5 in
147.5 in
Standard here, not on the base trim: 3.0L DOHC I-6 Turbo-Diesel – 305 hp / 495 lb.-ft. torque, Rancho shocks (AT4), Trailer Brake Controller (standard on SLE trim and above)
Specifications
Source: manufacturer press kit
Brakes
Front brake diameter
330 mm
Front brake type
Vented disc
Rear brake diameter
345 mm
Rear brake type
Vented disc
Dimensions Exterior
Ground clearance
11.2 in
Overall height
78.3 in
Overall length
231.9 in
Overall width
81.2 in
Wheelbase
147.5 in
Engine Basics
Aspiration
twin turbo
Cylinder count
4
Engine displacement
2700 cc
Fuel injection system
gdi mpi
Engine type (full description)
2.7L Turbo DOHC VVT DI with Active Fuel Management
Valve configuration
Dual-overhead camshafts, four-valves per cylinder
Engine Output
Horsepower
310 hp
Torque
430 lb-ft
Fuel Economy
MPG (city)
17 mpg
MPG (highway)
18 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 Rancho shock absorbers
Rear suspension type
Solid axle with semi-elliptic, variable-rate, two-stage multileaf springs, splayed Rancho shock absorbers
Tires
Tire size
LT275/65R18
Transmission
Final drive ratio
3.4
Transmission speeds
8
Transmission type
automatic
Weights
Curb weight (maximum)
5130 lbs
Curb weight (minimum)
5010 lbs
Gross vehicle weight rating
7000 lbs
Payload capacity
1930 lbs
Wheels
Wheel diameter
18 in
Wheel material
Aluminum
Wheel width
8.5 in
Standard & optional equipment
Source: manufacturer press kit
Safety2 std · 0 opt
Cruise Control (standard on Pro trim)
Four-wheel disc with electro-hydraulic power assist and ABS
Powertrain5 std · 1 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
5.3L V-8 VVT DI with Dynamic Fuel Management – 355 hp / 383 lb.-ft. torque
8-speed automatic transmission (2.7L)
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
Rancho shocks (AT4)
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.
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Common questions about the AT4
Source: EPA, NHTSA and manufacturer press kits
What does the 2025 GMC Sierra AT4 add over the Pro?
Against the Pro, 3 features become standard that the Pro does not and 19 published specifications differ. Both lists are on this page, taken from the manufacturer's own press material.