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The 40 mpg Cars of 2013

2008 GMC Sierra 2500 HD Extended Cab

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Curious about the newer model? Check out the 2013 GMC Sierra 2500 HD Extended Cab

Overview

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2008 GMC Sierra 2500 HD Extended Cab Review

By KBB.com Editors

Even though, for several decades, GMC has represented little more than a rebadged Chevrolet, in 2007 GMC made a concerted effort to distinguish itself from its divisional sibling. With the 2008 GMC Sierra HD trucks, GM's engineers have also made a concerted effort to increase the differentiation between the Heavy Duty pickups and their lighter-duty 1500 counterparts.

You'll Like This Car If...

Whether purchasing for commercial construction, agriculture or recreational towing, if your needs are truly "heavy-duty" you'll likely find those needs met with the 2008 GMC Sierra HD, which offers all of the virtues, with few of the vices, normally associated with a "heavy-duty" truck.

You May Not Like This Car If...

The Heavy Duty's principal mission is to haul or tow big and heavy things. If you don't need this sort of vehicle and its "heavy-duty" attributes, you'll probably be happier with something not quite so robust.

What's New for 2008

XM Satellite Radio is made standard on all models, while dual-rear-wheel versions receive new 17-inch wheels. A power driver's seat is now available on Regular Cab models.

Driving the Sierra 2500 HD Extended Cab

Driving Impressions Given the number of drivetrain, cab and chassis variations in the GMC lineup, it's difficult to provide one set of observations regarding drivability. However, everything GMC's engineering team did to...

enhance the driving experience has worked. A more rigid frame, in combination with widened track and retuned suspensions (Z85, standard on 2WD and 4WD models; and Z71, the optional Off-Road suspension), supplies the needed capability without imposing the typical vices of a heavy-duty platform. The ride is composed, handling stable and steering accurate with good on-center feel. With the 6.0-liter gasoline V8, performance might be described as "almost recreational." The Duramax does what diesels do, pulling a lot of load (up to 13,000 lbs.) in an authoritative manner.

Favorite Features

Six-Speed Automatic
This transmission has two overdrive gears to provide relaxed cruising with lower engine speeds and a first gear that's intended to enhance off-the-line response. Of importance to those towing is both Driver Shift Control (tap up and down) and standard Tow/Haul Mode. Though some may wish for an available manual transmission, the six-speed automatic's overall excellence might cure you from wanting to shift your own gears.

Gen-IV 6.0L V8 (Gasoline)
For sheer day-in, day-out driving pleasure the 6.0-liter gasoline V8 is terrific, offering extraordinary response for a vehicle this large.

2008 GMC Sierra 2500 HD Extended Cab Details

Interior

With the 2008 GMC Sierra there are two available interiors. The base and mid-level Sierra HD standard interior is all about functionality, with an instrument panel focused on ergonomic ease, specific door panels offering larger door pulls and handles, a specific center console and two glove boxes. The "luxury" interior of the SLT trim level offers a driving environment straight out of a top-of-the-line Yukon. With a distinct instrument design, large center console and other specific trim elements the end result is decidedly upscale.

Exterior

"Upmarket" might be a kiss-of-death descriptive for a heavy-duty pickup, but it will work for the 2008 GMC Sierra HD. The grille is framed by a large chrome or black surround, with the GMC logo as its centerpiece, and is flanked by large headlamps. Corner lights wrap into the flared front fenders, which complement the bulge atop the hood, and there is a sleeker profile by virtue of a 57-degree windshield angle. Functionally, large door handles are "grab-style" (for ease of operation while wearing work gloves), doors extend over the rocker panels and, on Extended Cab models, the rear doors open 170 degrees.

Notable Equipment

Standard Equipment

For truck-oriented capability few things beat power; GMC's standard 6.0-liter Gen IV V8 delivers 353 horsepower and 373 lb.-ft. of torque, and a six-speed automatic transmission meshes perfectly with the engine's capability. Standard safety features include seat-belt pretensioners, tire-pressure monitoring and OnStar.

Optional Equipment

For many, selecting the diesel is a no-brainer; GM's Duramax turbo-diesel provides plenty of power and is a lot quieter and smoother than diesels of the past. Those carrying lots of random cargo might better organize it with GM's cargo management system, those living in either excessively cold or warm climates will benefit from remote starting on certain trim levels and those wishing to be entertained will enjoy an enhanced DVD system and CD/MP3 audio. Finally, people who worry about getting lost should opt for the available touch-screen navigation system.

Under the Hood

GMC offers two engine choices. Base power is the 6.0-liter gasoline V8 which delivers 353 horsepower and 373 lb.-ft. of torque. Although the EPA doesn't provide a rating for vehicles in this category, past experience suggests GM gasoline engines deliver competitive fuel economy. For those wanting more, the 6.6-liter Duramax provides 365 horsepower and a remarkable 660 lb.-ft. of torque

6.0 liter V8
353 horsepower @ 5400 rpm
373 lb.-ft. of torque @ 4400 rpm
EPA city/highway fuel economy: N/A

6.6 liter V8 Turbo Diesel
365 horsepower @ 3200 rpm
660 lb.-ft. of torque @ 1600 rpm
EPA city/highway fuel economy: N/A

To compare current market prices, check out KBB.com's car classifieds to view the new and used GMC Sierra 2500 HD Extended Cab vehicles for sale near you.

Trading in or Selling? Know where you stand with the most up-to-date Kelley Blue Book Value at your fingertips. See your car's value

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2008 GMC Sierra 2500 Consumer Reviews

Overall Rating

8.9

Out of 10

Based on 671 Ratings for the 2007 - 2013 models.

Review this car

Value

9.0/10

Quality

9.0/10
Reliability

9.3/10

Performance

9.2/10
Comfort

9.2/10

Styling

9.1/10

I guess the newnes is still here...lol

By Greg C (FL) on Sunday, June 09, 2013

I own this car - My approximate mileage is 3,500

10 10.0

overall rating 10 of 10rating details

Reviewer Ratings

Overall Rating: 10/10
Value: 10/10
Reliability: 10/10
Quality: 10/10
Performance: 10/10
Styling: 10/10
Comfort: 10/10

Pros: "Everything"

Cons: "Nothing"

Likely to recommend this car? (1-10): 10

"I guess Im still happy from having a new truck.. Being a guy that never had much Worked my but off now i can afforn a nice new vehicle.. I pretty happy with mine. Dont have any complaints.... And I actualy like the salesman. I didnt want to ring there neck out after purchase... If God is willing My next one will be the the big Diesel.... Very Happy Camper...."

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I guess the newnes is still here...lol

By Greg C (FL) on Sunday, June 09, 2013

I own this car - My approximate mileage is 3,500

10 10.0

overall rating 10 of 10rating details

Reviewer Ratings

Overall Rating: 10/10
Value: 10/10
Reliability: 10/10
Quality: 10/10
Performance: 10/10
Styling: 10/10
Comfort: 10/10

Pros: "Everything"

Cons: "Nothing"

Likely to recommend this car? (1-10): 10

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My first truck couldn't have been a better one!

By dozer13 (TX) on Friday, May 31, 2013

I own this car - My approximate mileage is 39,800

10 9.0

overall rating 9 of 10rating details

Reviewer Ratings

Overall Rating: 9/10
Value: 8/10
Reliability: 10/10
Quality: 10/10
Performance: 9/10
Styling: 10/10
Comfort: 10/10

Pros: "seats, Bose stereo, exterior looks, reliable"

Cons: "as predicted-gas mileage typical of a truck, price"

Likely to recommend this car? (1-10): 10

"My first truck, could not be a better one. There may be better trucks out there, but GMC provides a solid truck that is reliable and safe. Very little problems. Highly recommended."

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Does it ALL

By Day (IN) on Monday, May 27, 2013

I own this car - My approximate mileage is 80,000

10 10.0

overall rating 10 of 10rating details

Reviewer Ratings

Overall Rating: 10/10
Value: 10/10
Reliability: 10/10
Quality: 10/10
Performance: 10/10
Styling: 10/10
Comfort: 10/10

Cons: "Used oil but the dealer did a good job fixing it."

Likely to recommend this car? (1-10): 10

"It handles great, looks great, pulls great, goes in the snow, goes in the field, is a real workhorse!!!"

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Does not compare well with Ford F150 Platinum

By mikeyg (NM) on Friday, May 24, 2013

I own this car - My approximate mileage is 5,891

10 6.0

overall rating 6 of 10rating details

Reviewer Ratings

Overall Rating: 6/10
Value: 6/10
Reliability: 6/10
Quality: 6/10
Performance: 8/10
Styling: 6/10
Comfort: 8/10

Likely to recommend this car? (1-10): 1

"I went from a Ford F150 to this Denali. I notice the following differences; Pros - The GMC rides nicer and the front interior cabin set up is nicer. I also think the GMC is a really good looking vehicle from front to back. Cons- The truck comes without a bed liner of any kind, the r/v camera is a joke and difficult to view when backing to a trailer, the back seat is cramped compared to Ford. Lots of road noise and back doors sound like tin cans when closing. Also the OnStar did not work and I had to take it back to the dealer to re-enter codes. Still didn't work. Spent three hours one afternoon on the phone with OnStar to get it to work (had to upgrade software on truck??!!??). The truck has a bad habit of locking its own doors whether you intend to lock them or not. I've been locked out three times. I now keep spare keys at various locations. In summary - nice looking and riding vehicle but leaves a lot to be desired at this price point."

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drive line slack

By shorthand (MS) on Saturday, May 18, 2013

I own this car - My approximate mileage is 3,000

10 3.0

overall rating 3 of 10rating details

Reviewer Ratings

Overall Rating: 3/10
Value: Not Rated
Reliability: Not Rated
Quality: Not Rated
Performance: Not Rated
Styling: Not Rated
Comfort: Not Rated

Pros: "Happy with truck except for above problem"

Cons: "problem has not been resolved"

Likely to recommend this car? (1-10): 1

"The truck has slack in the drive train. It is more noticeable in stop and go traffic, and when you turn to the right you can hear a clunk noise as the slack comes out of the drive line. I took the truck back to the dearlership and was told by the technician that I was not the only one who had this same problem. According to GM and the dealership the solution was for me to change my driving habits."

4 people out of 4 found this review helpful

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See all 671 reviews