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2008 GMC Sierra 2500 HD Extended Cab

Overview
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2008 GMC Sierra 2500 HD Extended Cab Review

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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.

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

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2008 GMC Sierra 2500 Consumer Reviews

Overall Rating
8.9
Out of 10

Based on 743 Ratings for the 2007 - 2013 models.

Review this car
  • Value
    9.0/10
    Quality
    9.1/10
  • Reliability
    9.3/10
    Performance
    9.2/10
  • Comfort
    9.2/10
    Styling
    9.1/10

Great Truck for work and/or pleasure

By on Saturday, September 20, 2014

I own this car - My approximate mileage is 20,300

10 9.0
overall rating 9 of 10rating details

Reviewer Ratings

Overall Rating
9/10
Value
9/10
Reliability
10/10
Quality
9/10
Performance
10/10
Styling
6/10
Comfort
10/10

Pros: "Rides great, tows awesome"

Cons: "Seat material"

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

"My only issue/complaint about this truck was the seat covering. They are the worst material for cleanup. I take my dog everywhere with me and even though he has a sheet/blanket that covers his "side", any dog hair what so ever that lands on these seat takes forever to remove. Even light coffee spills, anything, it's the worst material ever for a truck. I hope they've made improvements on this. Otherwise, have owned 4 Silverados and although I loved them, now with the Sierra, I'll always stick with this."

18 people out of 35 found this review helpful

the truck has custom wheels and tires and lift

By on Friday, September 12, 2014

I own this car - My approximate mileage is 120,000

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

Pros: "lift kit , mud tires, heated seats and leather"

Cons: "none"

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

"my truck has custom 17" rims and 33" tires with a 5" rough country suspension lift and has heated seats"

22 people out of 41 found this review helpful

Very reliable, no problems in 75k miles

By on Tuesday, September 09, 2014

I own this car - My approximate mileage is 75,000

10 9.0
overall rating 9 of 10rating details

Reviewer Ratings

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

Pros: "Appears to hold its value"

Cons: "Throttle lag"

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

"For a baseline pickup, I am very satisfied with its reliability and driveability. The only negative is throttle lag with the 4.3 V-6 engine."

3 people out of 6 found this review helpful

I Love My Truck

By on Wednesday, August 27, 2014

I own this car - My approximate mileage is 110,000

10 8.0
overall rating 8 of 10rating details

Reviewer Ratings

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

Pros: "loaded and smooth ride"

Cons: "big truck means plenty of gas"

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

"We purchased this truck in 2007 but it is a 2008 model. When we first saw it we knew we had to have it. The body of the truck was amazing and had everything you can ask for inside. We have enjoyed it with no troubles as of yet. Hope to keep it for a very long time."

7 people out of 13 found this review helpful

One NICE truck!

By on Tuesday, August 26, 2014

I own this car - My approximate mileage is 7,000

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

Pros: "Like driving a Lexus"

Cons: "None"

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

"I've owned quite a few vehicles through the years...this has to be the best one ever. You are inside and hear nothing from the outside. Going down the road not a creak or rattle to be heard. And talk about power...I have the Denali with 403 hp...no passing problems here. MPG is not that great, but I have been told by others I seem to have a "lead foot"...."

1 person out of 1 found this review helpful

Love this truck.

By on Tuesday, August 19, 2014

I own this car - My approximate mileage is 71,000

10 9.0
overall rating 9 of 10rating details

Reviewer Ratings

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

Pros: "Power, comfort, options, rear dvd trip fun, ride"

Cons: "AWD wish it was selectable, no bluetooth"

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

Clean Denali

"I really enjoy this truck and am very happy to own it. The long trips with 4 people are great with the DVD player for the back seat. It makes the time fly by."

Clean Denali

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