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2008 GMC Sierra 3500 HD Extended Cab

Overview
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2008 GMC Sierra 3500 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 3500 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 3500 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

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 3500 Consumer Reviews

Overall Rating
8.9
Out of 10

Based on 712 Ratings for the 2007 - 2013 models.

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

Solid Straight forward Truck plus Comfortable

By on Friday, April 11, 2014

I own this car - My approximate mileage is 30,393

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
9/10
Styling
9/10
Comfort
10/10

Pros: "Good vehicle for the price."

Cons: "With moderen technology gas milage could be better"

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

"I have owned other trucks which did the job. But this GMC not only does the job with ease, ride and comfort. I have not ever been stranded by this vehicle."

Solid Straight forward Truck plus Comfortable

By on Friday, April 11, 2014

I own this car - My approximate mileage is 30,393

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
9/10
Styling
9/10
Comfort
10/10

Pros: "Good vehicle for the price."

Cons: "With moderen technology gas milage could be better"

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

"I have owned other trucks which did the job. But this GMC not only does the job with ease, ride and comfort. I have not ever been stranded by this vehicle."

This is a great truck and a great value.

By on Wednesday, March 05, 2014

I own this car - My approximate mileage is 4,000

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: "Great value and holds it's value."

Cons: "No down side to this truck."

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

"The GMC Sierra 1500 extended cab is one of the best trucks I have owned. I have a 2012 and like it so well, I am having a hard time selling it. I love the new design, so I will probably will end up trading. This truck is well worth the money and really holds its value. Buy it, you won't be sorry."

6 people out of 12 found this review helpful

Good sturdy truck / rated mileage inaccurate

By on Tuesday, February 18, 2014

I own this car - My approximate mileage is 61,000

10 8.0
overall rating 8 of 10rating details

Reviewer Ratings

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

Likely to recommend this car? (1-10): 8

"Only two issues: Max mileage rating of 21mpg is @ 55mph on level road & more interior road noise than I had expected. No other issues."

1 person out of 1 found this review helpful

Excellent truck!

By on Sunday, February 16, 2014

I own this car - My approximate mileage is 49,000

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

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

"This truck is has been better than I even expected. Still enjoy driving it 2.5 years later and 49000 miles."

1 person out of 1 found this review helpful

great truck for pulling travel trailer

By on Wednesday, January 29, 2014

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

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
7/10
Styling
8/10
Comfort
7/10

Pros: "Really good price"

Cons: "If something breaks, get ready to pay for it."

Likely to recommend this car? (1-10): 9

"Love the power this truck has for pulling our travel trailer. Rides good even with the heavier suspension and fuel mileage is not bad. Does everything I could ask of a diesel 4x4! Have talked to fellow truck owners that have Ford and Dodge, think I came out on top with this one!"

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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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