Overview & Reviews

GMC has long been a mainstay of American byways and highways. Originally used and respected by farmers, construction workers and small-business owners, GMC's hauler was a basic workhorse known for its reliability and longevity. More recent times have seen GMC's full-size truck adopt the name Sierra. And with a variety of body styles, powertrains and trim levels, the Sierra is as adept at serving as the weekday family car.

However, this is the 2500HD version we're talking about. Though "HD" has become a familiar pop-culture concept in recent years, rest assured that the HD part of GMC Sierra 2500HD does not, in fact, involve plasma or LCD TVs. In this case we're talking the old-fashioned meaning of HD: "Heavy Duty." As one of two GMC heavy-duty full-size pickups, the 2500HD is a true workhorse that adds big-league power, towing and hauling capabilities to its family-ready credentials.

Current GMC Sierra 2500HD
The GMC Sierra 2500HD is available in regular, extended or crew cab designs, with a long or short wheelbase, and with rear- or four-wheel drive. The extended and crew cab body styles are offered in four trim levels: Work Truck, SLE, SLT and top-of-the-line Denali. The regular cabin can only be had in Work Truck and SLE trims. Moving up through the ranks obviously adds more style and features, culminating in the top-shelf Denali.

Standard on all Sierra 2500HD pickups is a 6.0-liter V8 that makes 360 horsepower and 380 pound-feet of torque, paired to a six-speed automatic transmission. The burly Duramax 6.6-liter turbodiesel V8 that puts out 397 hp and 765 lb-ft of torque is optional. Its standard Allison six-speed automatic is well suited to towing and hauling large loads.

In a recent comparison test, GM's heavy-duty trucks came out on top thanks to superior all-around performance. Although multigenerational brand loyalty may dictate what heavy-duty pickup you take home, sticking with (or switching to) the GMC Sierra 2500HD would be a solid decision.

Used GMC Sierra 2500HD Models
The present-generation GMC Sierra 3500HD debuted for the 2007 model year. Originally, the 6.0-liter gasoline V8 produced 353 hp and 373 lb-ft of torque, while the 6.6-liter diesel V8 was good for 365 hp and 660 lb-ft. The gasoline engines' current output arrived for 2010.

More changes occurred for 2011 when the Sierra received an all-new frame along with new suspension components (for greater towing capacity and a smoother ride), a more potent turbodiesel engine cranking out 397 hp and 765 lb-ft (previously 365 hp and 660 lb-ft) and the debut of the ultra-plush Denali trim level.

The previous-generation Sierra 2500HD was sold from 2001-'06 and lived on one more year as the "Classic" for 2007. There was a heavy-duty package available for the light-duty Sierra 2500 in 1999 and 2000. That light-duty Sierra 2500 has been discontinued. In terms of updates, there were changes made to the exterior and interior styling for 2003, with further exterior tweaks for 2005. These trucks came in Work Truck (after '03), SL, SLE and SLT trim levels.

The standard engine was a 6.0-liter V8 that made 300 hp and 360 lb-ft of torque. There were two optional engines: an 8.1-liter gasoline V8 producing 340 hp and 455 lb-ft and a 6.6-liter turbodiesel producing 300 hp and 520 lb-ft. This diesel was upgraded in 2006 for more power and refinement and fewer emissions. It made 360 hp and a whopping 650 lb-ft of torque. These engines carried over for the Classic. A five-speed manual transmission was standard with the 6.0-liter V8, with a four-speed automatic optional. The 8.1-liter V8 and diesel engines came with either a six-speed manual or five-speed automatic (which became a six-speed for 2006).

As with the current GMC Sierra 2500HD, we were always impressed by this generation's powerful engine lineup and substantial towing and hauling abilities. It was a reasonably comfortable truck for everyday use, but don't expect the plush ride of its light-duty siblings. Any of the three available engines will provide swift acceleration and ample towing power, but the diesel V8 is probably the best choice for those who tow heavy loads -- especially the more powerful 2006 Duramax. Our principal beef concerns the shoddy interior design, materials and build quality. GMC improved it gradually during its lifespan, but it was never quite up to snuff.

The previous-generation GMC Sierra 2500 ran from 1988-'98 with a significant refresh for 1995. It was known as the Sierra 2500 Classic for 1999 and 2000. Strengths of these pickup trucks include strong, durable powertrains, while weaknesses center on sketchy build quality and materials within the cabin.

User Reviews:

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  Honestly a Great Truck Overall - 2006 GMC Sierra 2500HD
  By Anthony - September 23 - 4:10 am

  I am a farmer and I use my truck very hard. But I do take very good care of it. I like the feeling that I know I can rely on my truck. I also hunt with my truck and I couldnt ask for a better, more dependable truck. I never yet have gotten stuck with it or ever had a problem with it stalling or anything like that. Ocassionally I take trips to northern Maine. I live in Southern Connecticut so it is quite the ride. Although with my Duramax deisel engine I can go there and back and have enough fuel to drive around. I like the chrome on the front bumper ecspecially it really makes the truck look solid. I know people that own Dodge trucks and Ford trucks and my truck definetly more dependable.

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  Very Pleased - 2011 GMC Sierra 2500HD
  By Richard Smith - May 29 - 6:33 pm

  Overall I am very pleased with this car and would prefer it to the rest in the bunch. The RAM did have a slightly better ride, but the towing capacity just wasnt up to par. There are several annoying things though: 1.The dash and center stack are kinda ugly and just dont look right 2.The headrest are in a akward position 3. The steering wheel doesnt telescope

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  Hot Rig..! - 2004 GMC Sierra 2500HD
  By bearman - May 22 - 2:00 am

  More truck than I expected, plenty of power. Very roomy, solidly built with great ride.

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  05 6.6 V8 - 2005 GMC Sierra 2500HD
  By troyman89 - May 5 - 6:16 pm

  Very nice truck. Lots of power for pulling my 35 foot race trailer. Good on fuel about 21 highway 18 in town. I put the banks 6 gun chip in it. Very fast. Sounds good and has lots of power

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  Better than expected - 2005 GMC Sierra 2500HD
  By Car Guy - May 5 - 10:00 am

  So far this vehicle has exceded my expectations as to power and towing ability. I could not believe I was passing other vehicles as I was going up hill pulling a 20 trailer with a car inside the trailer. The gas mileage continues to improve as the vehicle breaks in. I love driving this vehicle and I am confident in its reliability.

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  My 2500-HD - 2001 GMC Sierra 2500HD
  By reeddallas - May 2 - 2:00 am

  I have owned many new vehicles from trucks to sports cars from Prosches (2), Corvettes (2), VWs (3), Fords (6), Dodges (1), Chevys (2), Mercedes, to Buicks (2). I have never owned any vehicle that has given me the driving satisfaction of never having a squeak, squeal, rattle, or mechainical problem: From dealer lot to 24,000 miles this has been an excellent vehicle and I congratulate GM for delivering the value. I gave this vehicle a relatively poor rating for gas economy but I do like the 6000 Vortec engine and I knew the gas requirements before I purchased the truck: Id buy this engine again gas economy notwithstanding.

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  It Seems Like a Keeper - 2009 GMC Sierra 2500HD
  By JCM - March 27 - 12:43 pm

  I just bought a 2009 GM 2500 with the Duramax/Allison combo. Been with Ford all my driving life. So far, a great truck. Excellent power, very quiet and greater than 20 mpg on highway when unloaded. Seems tightly made. 2008 F250 previously; a great truck but physically too large for my needs. GMC offers similar towing performance, better mileage so far and a better ride in a physically smaller package-- with diesel power. Overall, I think the GMC offering is the top overall in the 2500/250 line for daily use/driving. I was not impressed with Dodge quality; my Ford was great but meant for wide open, all day towing. GMC offered the best package with the fewest comprimises. Very happy so far.

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  GMC 2500 HD/ Durmax Diesel - 2004 GMC Sierra 2500HD
  By tabinmn - March 24 - 10:00 am

  I appreciate the diverse choices when purchasing vehicles but choose to pick GM d/t the ability to find anything from fast sports cars, Corvette, to tough Durmax Diesel. The current Vehicle of choice is as described above and I wouldnt tow w/out the performance of the GMC Sierra 2500 HD Durmax Diesel. Not only does the beautifully engineered design look great driving down the highway but also performs outstanding w/absolutely no problems. This is my 3rd Duramax and would recommend it to any serious driver that needs a truck w/towing capacity. Not to mention gas milege...what truck of this capacity can get

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  What a fun beast! - 2005 GMC Sierra 2500HD
  By Stuart Schotte - February 23 - 5:03 pm

  Bought it new last month. I had a problem with the overflow tank leaking into the wiring harness and ruining a control module. 10 days in the shop and then the radio had to be replaced. Some gremlins in the electronics. If it is all fixed this will be my dream truck! I have the diesel. I am getting about 17mpg at 70-75 on the highway vs 14 for my 2002 Chevy K1500 w/ the 5.3 ltr. This thing will go straight up mountains without downshifting! What a beast! I was towing about 9k lbs behind the Chevy. I cant wait to hook "Max" up to the trailer! XM is nice for trips too. I have the buckets in front and the console encroaches on my leg when driving (Im 64"), but you get used to it!

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  great - 2004 GMC Sierra 2500HD
  By thumper47 - October 27 - 10:00 am

  the truck has been a great truck i dont think u can get a better one