AT4/AT4X 4WD 6.2L 4WD
What the AT4/AT4X 4WD 6.2L adds over the Sierra 1500 2WD
| Spec | Sierra 1500 2WD | AT4/AT4X 4WD 6.2L |
|---|---|---|
| Curb weight (maximum) | 4760 lbs | 5780 lbs |
| Curb weight (minimum) | 4420 lbs | 5410 lbs |
| Aspiration | twin turbo | naturally aspirated |
| Cylinder count | 4 | 8 |
| Engine displacement | 2700 cc | 6200 cc |
| Horsepower | 310 hp | 420 hp |
| Torque | 348 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, variable valve timing |
| Ground clearance | 7.8 in | 11.1 in |
| Gross vehicle weight rating | 6800 lbs | 7100 lbs |
| MPG (city) | 19 mpg | 14 mpg |
| MPG (highway) | 22 mpg | 17 mpg |
| Overall height | 75.6 in | 78.3 in |
| Payload capacity | 2020 lbs | 1290 lbs |
| Front suspension type | Independent coil-over-shock with twin-tube shock absorbers | Independent coil-over-shock with twin-tube shock absorbers; Rancho shocks with X31 pkg |
| 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 twin-tube shock absorbers; Rancho shocks with X31 pkg |
| Transmission speeds | 8 | 10 |
| Wheel diameter | 17 in | 18 in |
| Wheel material | steel | aluminum in black |
| Wheel width | 8 in | 8.5 in |
| Wheelbase | 147.4 in | 157.1 in |
Standard here, not on the base trim: 18-in. x 8.5-in. aluminum wheels in black (standard AT4X), 6.2L V-8 VVT DI with Dynamic Fuel Management – 420 hp / 313 kW @ 5600 rpm, 460 lb.-ft. / 623 Nm @ 4100 rpm, EPA-Est. MPG: 6.2L V-8 – 15 city / 19 hwy (4WD); 14 city / 17 hwy (4WD – AT4 & AT4X), LT265/60R20 Goodyear Wrangler Territory tires, LT275/65R18 Goodyear Wrangler DuraTrac tires, Two-speed transfer case or Autotrac automatic transfer case with 4WD, depending on model
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 | 11.1 in |
| Overall height | 78.3 in |
| Overall length | 231.9 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, variable valve timing |
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 | 39.9 in |
Legroom
| Front legroom | 44.5 in |
| Second-row legroom | 35.2 in |
Shoulder Room
| Front shoulder room | 66 in |
| Second-row shoulder room | 64.9 in |
Steering
| Steering type | Electric power-assisted rack-and-pinion |
Suspension
| Front suspension type | Independent coil-over-shock with twin-tube shock absorbers; Rancho shocks with X31 pkg |
| Rear suspension type | Solid axle with semi-elliptic, variable-rate, two-stage multileaf springs, splayed twin-tube shock absorbers; Rancho shocks with X31 pkg |
Tires
| Tire size | LT265/60R20 |
Transmission
| Final drive ratio | 3.4 |
| Transmission speeds | 10 |
| Transmission type | automatic |
Weights
| Curb weight (maximum) | 5780 lbs |
| Curb weight (minimum) | 5410 lbs |
| Gross vehicle weight rating | 7100 lbs |
| Payload capacity | 1290 lbs |
Wheels
| Wheel diameter | 18 in |
| Wheel material | aluminum in black |
| Wheel width | 8.5 in |
Standard & optional equipment
Source: manufacturer press kitSafety4 std · 0 opt
- Electronic Stability Control
- Four-wheel disc brakes with electro-hydraulic power assist, ABS; vented front and rear Duralife rotors – 13 x 1.18 in. front / 13.6 x 0.79 in. rear
- Four-wheel disc with electro-hydraulic power assist and ABS
- Traction Control
Exterior6 std · 0 opt
- 18-in. x 8.5-in. aluminum wheels in black (standard AT4X)
- 20-in. x 9-in. aluminum polished wheels (standard Denali)
- 22-in. x 9-in. aluminum polished wheels (available Denali)
- 22-in. x 9-in. aluminum ultra-bright machined wheels (Denali Ultimate)
- LT265/60R20 Goodyear Wrangler Territory tires
- LT275/65R18 Goodyear Wrangler DuraTrac tires
Powertrain10 std · 0 opt
- 10-speed automatic transmission (10L80) – for 3.0L, 5.3L and 6.2L engines
- 2.7L Turbo DOHC VVT DI with Active Fuel Management – 310 hp / 231 kW @ 5600 rpm, 348 lb.-ft. / 473 Nm @ 1500-4000 rpm
- 3.0L DOHC I-6 Turbo-Diesel – 305 hp / 227 kW @ 3750 rpm, 495 lb.-ft. / 365 Nm @ 1500 rpm
- 5.3L V-8 VVT DI with Dynamic Fuel Management – 355 hp / 265 kW @ 5600 rpm, 383 lb.-ft. / 519 Nm @ 4100 rpm
- 6.2L V-8 VVT DI with Dynamic Fuel Management – 420 hp / 313 kW @ 5600 rpm, 460 lb.-ft. / 623 Nm @ 4100 rpm
- 8-speed automatic transmission (8L90) – for 2.7L engine
- Axle ratio: 3.23 (5.3L, 3.0L); 3.42 (2.7L, 5.3L with Max Trailering Pkg., 6.2L); 3.73 (3.0L with Max Trailering Pkg.)
- EPA-Est. MPG: 6.2L V-8 – 15 city / 19 hwy (4WD); 14 city / 17 hwy (4WD – AT4 & AT4X)
- Fuel tank capacity (approx.): Regular Cab 28.3 gal. / 107L; Double Cab 24 gal. / 91L; Crew Cab 24 gal. / 91L (22 gal. / 83L for 2WD diesel models)
- Two-speed transfer case or Autotrac automatic transfer case with 4WD, depending on model
Chassis3 std · 0 opt
- Electric power-assisted rack-and-pinion steering
- Independent coil-over-shock front suspension with twin-tube shock absorbers; Rancho shocks with X31 pkg.
- Solid axle rear suspension with semi-elliptic, variable-rate, two-stage multileaf springs, splayed twin-tube shock absorbers; Rancho shocks with X31 pkg.
Ranked by what shoppers ask about first; standard equipment before options.
Transcribed from the manufacturer's official press kit for the 2023 Sierra. Confirm with the window sticker for a specific unit.
Factory warranty running out?
The 2023 GMC Sierra is in the years where transmission, electronics and drivetrain repairs land on the owner. What an extended plan does and does not cover is worth reading before a dealer quotes you one.
What to check before you buy →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 AT4/AT4X 4WD 6.2L
Source: EPA, NHTSA and manufacturer press kitsWhat does the 2023 GMC Sierra AT4/AT4X 4WD 6.2L add over the Sierra 1500 2WD?
Against the Sierra 1500 2WD, 6 features become standard that the Sierra 1500 2WD does not and 22 published specifications differ. Both lists are on this page, taken from the manufacturer's own press material.