GMC engines are engineered to give you confidence and control, whether you’re towing a light load, a heavy load, or nothing at all. In general, the higher the series number on a GMC vehicle, the greater the carrying capacity. For example, the GMC Sierra 3500HD offers a best-in-class 1-ton-maximum fifth-wheel trailering capability of 23,000 lbs,1 whereas the incredibly efficient Sierra 1500 has a max trailering capacity up to 10,700 lbs.2 In fact, no competitor has better available V8 fuel economy than the Sierra 1500.3
Mile after mile, our Vortec engines reassert their reputation for stand-up performance, innovation and breakthrough engineering. It’s the choice engine for many of our vehicles—from the Sierra 1500’s efficient 4.3L V6 to the Yukon’s powerful 5.3L V8. The Vortec is even used in our Yukon Hybrid, along with a 300-volt battery pack that’s strong enough to propel the Yukon Hybrid up to 25 MPH on electric power alone.
VORTEC CYLINDER HEAD
Unique cylinder-head construction improves the air-fuel mixture for enhanced performance.
ADVANCED COOLING SYSTEM
The Vortec’s cooling system distributes equal amounts of coolant to the cylinder case for more efficient cooling.
ELECTRONIC THROTTLE CONTROL
The electronic throttle control system optimizes drivability and fuel economy,4 and reduces emissions.
The internally balanced crankshaft reduces stress for enhanced durability.
ACTIVE FUEL MANAGEMENT (AFM)
In situations where you don’t need extra power, such as cruising down the highway on level roads, Sierra and Yukon’s AFM deactivates four of the engine’s eight cylinders. When load demands increase, all cylinders are reactivated to provide maximum power.
The DURAMAX Diesel 6.6L V8 with 765 lb-ft of torque provides superior power for accelerating and decelerating with large loads in tow. Its use of diesel not only increases the engine’s power and acceleration, it increases fuel efficiency. The DURAMAX is integrated with the available Allison 1000 six-speed automatic transmission to harness and deliver all of its towing power.
Find the available DURAMAX Diesel with Allison 1000 six-speed transmission in the Sierra 2500HD and 3500HD, and the GMC Savana.
GMC has engineered a number of features, packages, and equipment options so that you can tow with confidence and power wherever the road may take you. Below are just some of the standard and available features.
LOCKING REAR DIFFERENTIAL Many GMC models are available with an Eaton® automatic locking rear differential, designed to improve traction in unpredictable terrain when one rear wheel is doing more work than the other. Once engaged, both rear wheels rotate at the same speed, providing more torque to the tire with better traction.
TOW/HAUL MODE An innovative tow/haul mode gives automatic transmissions on select models a dual-mode shift program. This feature raises upshift points to use more of the engine’s power for strong acceleration and raises downshift points to help slow the truck using engine braking.
INTEGRATED TRAILER BRAKE CONTROL This optional system connects the brake pedal to the trailer’s brake controllers. A dashboard-mounted controller switch turns the system on and off.
REAR VISION CAMERA The optional Rear Vision Camera can make it easier to back up and align your vehicle’s hitch to the trailer. The system uses the rearview mirror display or the available in-dash navigation screen to help you see exactly what’s behind you.
WIRING HARNESS This allows you to connect the electrical components of your trailer—signals, brake lights, and brake controllers—to your vehicle. Choosing the right wiring harness can streamline the connection process.
THE Z82 TRAILERING PACKAGE The Z82 Package includes a trailer-hitch platform and may include other trailering equipment. An optional Heavy-Duty Trailering Equipment Package is also available for a wide variety of GMC models.
1. When properly equipped. Maximum trailer weight ratings are calculated assuming a base vehicle, except for any options necessary to achieve the rating, plus driver.
2. Trailering weights are calculated assuming properly equipped vehicle, plus driver and one passenger. The weight of other optional equipment, passengers and cargo will reduce the trailer weight your vehicle can tow. See dealer for details.
3. EPA-estimated 15 city/21 hwy MPG with the 5.3L V8 engine. Based on 2012 GM Large Pickup segment.
4. EPA-estimated city/hwy MPG: Sierra 1500 with Vortec 4.3L V6, 15/20; Sierra XFE with Vortec 5.3L V8, 15/22; Yukon with Vortec 5.3L V8, 15/21; Yukon Hybrid with Vortec 6.0L V8, 20/23; Yukon XL with Vortec 5.3L V8, 15/21.
5. V6 equipped models only.
6. EPA-estimated 15 city/21 hwy MPG. Based on 2011 GM Large SUV segment.
7. EPA-estimated mpg: Canyon Crew Cab 2WD with 2.9L I-4 engine, 18 city/25 hwy.; Savana 1500 2WD with 5.3L V8 engine, 13 city/17 hwy.; Sierra 1500 XFE with 5.3L V-8 engine, 15 city/22 hwy.; Yukon with 5.3L V8 engine, 15 city/21 hwy.
8. Cargo and load capacity limited by weight and distribution.