It says that compromise should never have a place in art or engineering. Which is why the 2012 GMC Sierra HD offers the only available fully automatic locking rear differential in its class. And it makes it all the more obvious that with professional grade, even everyday life can be a work of art.
| Regular Cab Long Box: 2500HD 2WD/4x4 and 3500HD Single Rear Wheel (SRW)/Dual Rear Wheel (DRW) 2WD/4x4 |
| Extended Cab Standard Box: 2500HD 2WD/4x4 |
| Extended Cab Long Box: 2500HD 2WD/4x4 and 3500HD SRW/DRW 2WD/4x4 |
| Crew Cab Standard Box: 2500HD 2WD/4x4 and 3500HD SRW 2WD/4x4 |
| Crew Cab Long Box: 2500HD 2WD/4x4 and 3500HD SRW/DRW 2WD/4x4 |
| 2500HD | 3500HD | |
| Standard Box cargo volume (cu. ft.)1 | 60.7 | 60.7 |
| Long Box cargo volume (cu. ft.)1 | 75.5 | 75.5 |
| Payload (lbs.)2 | 4,192 | 6,635 |
| Fuel tank (gal. approx.) | 36 | 36 |
| Seating (Regular Cab/Extended Cab and Crew Cab) | 3/6 | 3/6 |
| Trailer weight rating (lbs.)3 | 17,800 | 21,700 |
| GVWR (lbs.)4 | 10,000 | 13,000 |
| Ultrasonic Rear Parking Assist5,6 (SLE and SLT only) |
| Liftgate with liftglass, remote, power-operated; includes rear-window wiper/washer |
| Rear-vision camera system |
| Recovery hooks |
| Remote vehicle starter system |
| Vortec 6.0L V8, with 360 hp (322 hp with box delete and on 3500HD models) and 380 lb.-ft. of torque |
| Automatic locking rear differential (std. on SLT; optional on WT and SLE) |
| Electronic shift transfer case (4x4 models only) (SLE and SLT only) |
| Handling/Trailering suspension |
| Manual shift-on-the-fly transfer case (4x4 models only) (WT only) |
| Oil cooler, engine: heavy-duty, external |
| Oil cooler, transmission: auxiliary, heavy-duty, external |
| Trailering Package: trailer hitch platform, seven-wire harness, automatic locking rear differential, integrated trailer brake controller |
| Six-speed automatic transmission with Tow/Haul mode7 |
| Duramax 6.6L Turbo-Diesel V8, with 397 hp and 765 lb.-ft. of torque8 (335 hp and 685 lb. -ft. of torque with box delete) |
| Allison® 1000 Series, six-speed automatic transmission with engine-grade braking and Tow/Haul mode9 |
| Exhaust brake10 |
| Skid Plate Package: frame-mounted shield protecting front underbody, oil pan, differential case and transfer case (requires 4x4 on WT models) |
| Snow Plow Prep Package: 10-amp power for backup and roof emergency light, high-flow front bumper, Skid Plate Package and electrical relays (4x4 models only; see dealer for additional ordering information) |
| Z71 Off-Road Suspension: 36mm shock absorbers, off-road jounce bumpers, automatic locking rear differential, Skid Plate Package and Z71 decals on rear-quarter panels (SLE, SLT and SRW models only) |
| Driver and right-front passenger frontal air bags11 |
| Four-wheel antilock disc brakes |
| Integrated trailer brake controller12 (std. on SLT; optional on WT and SLE) |
| OnStar®:13 Directions & Connections® Plan for the first six months (optional on WT) |
| StabiliTrak Electronic Stability Control System (SRW models only) |
| Head-curtain side-impact air bags11 |
| Seat-mounted side-impact air bags11 for thorax and pelvic protection |
| Air conditioning: manual (WT and SLE only) |
| Air conditioning: automatic, dual-zone (std. on SLT; optional on SLE) |
| Power, rear-access door windows14 (SLE and SLT only) |
| Power sunroof (SLT only) |
| Power-sliding rear window5,15 (SLE and SLT only) |
| Rear-vision camera system (display in rearview mirror or nav screen if equipped) (SLE and SLT only) |
| Vinyl 40/20/40 split-bench seat with recliners (WT only) |
| Premium Cloth 40/20/40 split-bench front seat with recliners, center armrest with storage and lockable underseat storage (also available with Custom Leather-appointed trim) (SLE only) |
| Custom Leather-appointed, reclining, heated, 10-way power-adjustable front bucket seats (SLT only) |
| Cloth 40/20/40 split-bench seat with recliners (WT only) |
| Premium Cloth reclining, six-way power-adjustable front bucket seats (also available with Custom Leather-appointed trim) (SLE only) |
| AM/FM stereo (WT only) |
| AM/FM stereo with CD/MP3 player (std. on SLE; optional on WT) |
| Bluetooth® wireless technology16 for select phones (std. on SLT; optional on WT and SLE) |
| Bose® speaker system (std. on SLT; optional on SLE) |
| SiriusXM Radio:17 with three trial months (std. on SLE and SLT; optional on WT) |
| AM/FM stereo with CD/MP3 player and USB port18 (std. on SLT; optional on SLE) |
| AM/FM stereo with in-dash six-disc CD/MP3 player and USB port18 (SLT only) |
| Rear-seat DVD entertainment system19 (SLT only) |
| Touch-screen navigation radio20 with CD/MP3/DVD player,21 USB port, 18 Radio Data System (RDS)22 and TheftLock (SLT only) |
| NavTraffic:23 with three trial months (SLT only) |
| 17-inch painted steel (2500HD) (WT only) |
| 17-inch machined-aluminum (2500HD) (SLE only) |
| 17-inch painted steel (3500HD DRW) |
| 18-inch polished forged-aluminum (2500HD) (std. SLT; optional on SLE) |
| 18-inch polished forged-aluminum (3500HD SRW) (SLT and SLE only) |
| 18-inch painted steel (3500HD SRW; optional on 2500HD WT) (WT only) |
| 17-inch chrome-clad steel (2500HD) (WT only) |
| 17-inch polished forged-aluminum19 (3500HD) (SLE only) |
| 20-inch polished forged-aluminum24 (2500HD) (SLT and SLE only) |