| 2011 GMC Sierra 3500HD Technical Specifications |
| Overview |
| Models: | regular, extended, and crew cab with standard or long box |
| Body style / driveline: | full-size one-ton heavy-duty pickup truck, 2-door regular cab and 4-door extended and crew cab, front engine, rear / four-wheel drive |
| Construction: | body-on-frame |
| EPA vehicle class: | full-size truck |
| Manufacturing location: | Flint, Michigan, Fort Wayne, Indiana |
| Key competitors: | Ford Super Duty Series, Ram heavy-duty pickup |
| Engines |
| | Vortec 6.0L V-8 (L96) | Duramax 6.6L Turbodiesel V-8 (LML) |
| Type: | 6.0L V-8 | 6.6L V-8 |
| Displacement (cu in / cc): | 364 / 5967 | 403 / 6599 |
| Bore & stroke (in / mm): | 4.00 x 3.62 / 101.6 x 92 | 4.06 x 3.9 / 103 x 99 |
| Block material: | cast iron | cast iron |
| Cylinder head material: | cast aluminum | cast aluminum |
| Valvetrain: | overhead valve, two valves per cylinder, variable valve timing | overhead valve, four valves per cylinder |
| Ignition system: | coil-near-plug, platinum-tipped spark plugs, low-resistance spark plug wires | compression, glow plug start aid |
| Fuel delivery: | sequential fuel injection | direct injection diesel with high pressure common rail |
| Compression ratio: | 9.6:1 | 16.0:1 |
| Horsepower (hp / kW @ rpm): | 360 / 268 @ 5400 <10,000 GVWR
322 / 240 @ 4400 > 10,000 GVWR | 397 / 296 @ 3000 |
| Torque (lb-ft / Nm @ rpm): | 380 / 515 @ 4200 | 765 / 1037 @ 1600 |
| Recommended fuel: | regular unleaded | diesel or B20 |
| Maximum engine speed (rpm): | 6000 | 3000 |
| Emissions controls: | three-way catalytic converter, positive crankcase ventilation, evaporative collection system | cooled exhaust gas recirculation (EGR), EGR cooling-bypass system, diesel particulate filter system (DPF), selective catalyst reduction (SCR) |
| Transmissions |
| | Hydra-Matic 6L90 | Allison 1000 |
| Type: | six-speed automatic (with Vortec 6.0L) | six-speed automatic (with Duramax 6.6L) |
| Gear ratios (:1): |
| First: | 4.03 | 3.10 |
| Second: | 2.36 | 1.81 |
| Third: | 1.53 | 1.41 |
| Fourth: | 1.15 | 1.00 |
| Fifth: | 0.85 | 0.71 |
| Sixth: | 0.67 | 0.61 |
| Reverse: | 3.06 | 4.49 |
| Final drive ratio: | 3.73 or 4.10 | 3.73 |
| Chassis / Suspension |
| Front: | all models: std long- and short-arm independent front torsion bar suspension |
| Rear: | semi-elliptic three-stage multi-leaf spring |
| Steering type: | integral power-assisted recirculating ball |
| Steering ratio: | 16:1 |
| Steering wheel turns, lock-to-lock: | 3.57 |