Standard here, not on the base trim: 3.0L DOHC I-6 Turbo-Diesel – 305 hp / 495 lb.-ft. torque, 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
7.7 in
Overall height
75.4 in
Overall length
241.4 in
Overall width
81.2 in
Wheelbase
157 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)
19 mpg
MPG (highway)
22 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 twin-tube shock absorbers
Rear suspension type
Solid axle with semi-elliptic, variable-rate, two-stage multileaf springs, splayed twin-tube shock absorbers
Tires
Tire size
P275/60R20
Transmission
Final drive ratio
3.4
Transmission speeds
8
Transmission type
automatic
Weights
Curb weight (maximum)
4930 lbs
Curb weight (minimum)
4810 lbs
Gross vehicle weight rating
7000 lbs
Payload capacity
1960 lbs
Wheels
Wheel diameter
20 in
Wheel material
Aluminum
Wheel width
9 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
Chassis4 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
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 SLT
Source: EPA, NHTSA and manufacturer press kits
What does the 2025 GMC Sierra SLT add over the Pro?
Against the Pro, 2 features become standard that the Pro does not and 15 published specifications differ. Both lists are on this page, taken from the manufacturer's own press material.