2011 GMC Sierra

2011 GMC Sierra

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Photos by -Autonet.ca
Rob Daly
Published: 30 08 2010

GM quietly confident over new HD

CALGARY — What can you say about a new truck that is, in many ways, a collection of enhancements on a series of existing workhorses?

Well, if you’re General Motors’ Canadian pickup team, you take a quiet, confident approach, saying, in effect, “We know this product is competitive, and we’re so confident in its performance, we’ll set up the competition ourselves.”

GM’s heavy duty pickup range includes ten 2500 models (regular, extended and crew cabs in two- and four-wheel drive configurations, with standard or long boxes) and eight single and dual-wheel 3500 models, some of which are capable of trailering an impressive 7,700+ kg (17,000 lbs.) via conventional hitch — nearly 9,850 (21,700 lbs.) on a fifth-wheel setup.

Facing the same stringent new emissions standards as its competition, GM has enhanced its 6.6-litre Duramax diesel engine to produce even more horsepower and torque while reducing emissions. A urea-based additive called Diesel Exhaust Fluid will be part of the truck’s scheduled maintenance routine from now on. The bottom line is, whether you’re using conventional diesel or a B20 biodiesel blend, your 397 horses and 765 lb.-ft. of torque will be greener than the expansive fields feeding Alberta’s legendary beef.

The other part of GM’s heavy duty powertrain formula has also undergone some changes. The Allison 1000 six-speed automatic transmission has been strengthened to handle the additional hauling power, and a long-awaited exhaust brake system now assists in keeping the big loads at manageable speeds.

If you’re not looking for the pure grunt of GM’s impressive diesel, there’s still a 6.0-litre Vortec gasoline V8 mated to a Hydra-Matic 6L90 six-speed automatic. The engine has been tweaked to offer better low-rpm torque and the transmission has had some modifications for greater durability.

The under-the-skin makeover goes right down to the skeleton, with significant strengthening in the frame, which is now fully boxed over the full length of the truck. GM upgraded the front frame structure and the independent front suspension. Front torsion bars are now adjustable, allowing for better performance and improved ride balance for trucks carrying heavy front-end loads — snowploughs, for example. At the back, larger asymmetrical leaf springs contribute to the trucks’ overall potential.

Clearly, this isn’t a minor makeover, it’s a major upgrade. But you’ll only notice it if you’re hauling with it. We hauled a 680-kg hay bale across southern Alberta at highway speeds and only remembered it was there when we tried to use the rearview mirror. With a 4,536 kg trailer hooked up back there, the GMC Sierra took on Alberta’s Kananaskis Trail without a qualm, breezing over the Highwood Pass (at 2,206 metres it’s the highest drivable pass in Canada) with power to spare. The exhaust brake is very effective, especially when used in tandem with the truck’s cruise control.

As good as they are as free-standing products, GM’s heavy duty 2011s don’t operate in a vacuum: they have some stiff competition in the popular Dodge Ram and Ford Super Duty, the latter being a complete rebuild for the 2011 model year. GM brought a 2010 Ram and a 2011 Super Duty to a private party on an airstrip near Nanton, Alberta and hooked them to loads similar to the trailer the Sierra was hauling.

With its five-speed transmission and smaller torque numbers, the Cummins-equipped Dodge fell behind both the Super Duty and Sierra in 610 metre acceleration tests. The Super Duty did give GM’s upgraded Duramax a run for its money, though — especially when allowed to ‘spool up’ a bit before leaving the starting blocks. Generally speaking, though, the Duramax proved it can get a load up to speed as quickly as or more quickly than the others. And it does it with style and comfort.

Summary:

Year/Make/Model
2011 GMC Sierra
Trim level
2500 HD; 3500 HD
Price range
$35,600-$59,210
Freight
$1,450
Options
6.6-litre Duramax diesel ($9,670); Allison 1000 six-speed transmission ($1,145)
Warranty (basic)
3 years/ 60,000 km
Warranty (powertrain)
5 years/160,000 km
Competitors
Ford Super Duty, Ram 2500/3500 HD

Strong Points

Weak Points

  • - Outstanding hauling capability
  • - comfort
  • - diesel option a big mark-up

Editors Rating:

Fuel consumption
Considering the capabilities, it's not bad
Value for price
Average owner can ignore the $36K base and count on $50K+
Styling
Not much changed on the outside, but it's still nice
Comfort
No complaints over the ride, especially loaded
Performance
Does what it's meant to do, with flying colours
overall
Once again one of the best in its niche

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