Overview & Reviews

Other than satellite radio becoming standard across the line, the 2008 GMC Sierra 2500HD sees no changes.

• Massive towing and hauling capacities, refined and quiet ride, excellent build and materials quality, comfortable seats.

• Side-impact airbags and side curtain airbags are not available.

User Reviews:

Showing 1 through 10 of 27.00

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  6.0 L Gas engine no slouch - 2008 GMC Sierra 2500HD
  By my new truck - January 11 - 9:36 pm

  This is the first 3/4 ton truck Ive ever owned and it is great. Ive had Fords in the past and know people with both the F250 and F350. Theyve had too many problems for me to even consider a Ford. The GMC is built stout, and while the gas engine lacks the torque that the diesel engine has it is the perfect engine for someone who does not tow all of the time. It has plenty of get up and Im getting around 14 MPG right now on the freeway at 75-80 MPH. Many of thr trucks I see pulling large trailers these days are GMC or Chevy, they must be doing something right. PS, while gas prices are high right now the purchase incentives are even higher, good time to buy a gas hog!

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  2nd Diesel, Im keeping this one - 2008 GMC Sierra 2500HD
  By Justin - June 23 - 10:20 am

  This is the 6.6L with the Duramax/Allison combination, not the 6.0L. I previously had an 05 with similar features but wasnt worth the buyout at the end of the lease. There are things I liked about the 05 that the 08 lacks but most of all, Im very pleased with the truck. Towing is great. Crewcab 8 bed is a long truck though. Park it at home if you intend to go into a city.

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  Absolutely Amazing! - 2008 GMC Sierra 2500HD
  By Roper - April 17 - 2:56 am

  I have owned 6-7 GM products over the last 25 years and I can honestly say that the appointments and driving ability of this vehicle are outstanding. Everything is perfect

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  08 GMC 3/4 duramax! is it worth it? - 2008 GMC Sierra 2500HD
  By qoh322 - August 2 - 9:26 am

  This truck drives awesome! Holds the road great and very powerful (duramax). Current gas mileage is only 15.5-16.7 still breaking in. Truck only has 600 miles. Color is sonoma red.

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  This is one super 3/4 ton truck - 2008 GMC Sierra 2500HD
  By Bill - June 4 - 8:00 am

  Bought an 08 Duramax 4x4 last month and just love the this truck. Ride is very predictable for a 3/4 ton, little harsh but if you wanted a smooth ride go with the 1/2 ton. The diesel has got a lot of horsepower. I love the quick acceleration this truck offers. I pull a trailer that goes about 6000 lbs. If youre looking for a truck to tow and gets generous fuel economy this is the truck.

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  My first 3/4 Ton Truck & Diesel - 2008 GMC Sierra 2500HD
  By Ryan - August 11 - 5:46 pm

  I previously owned a 1999 Silverado 1500 4X4 Extended Cab Standard Bed and a 2007 Sierra 1500 4X4 Extended Cab Standard Bed I wanted to upgrade to something more powerful with more room. While I really dont need it for towing at this point, I can only imagine how great of a towing vehicle this will be. I am very impressed with the power of the Duramax diesel, as well as how quiet it is compared to the Ford Power Stroke and the Cummins in the Dodge. I test drove all 3 brands, and what won me over was the performance and power of the Duramax, as well as how much smoother the Allison Tranny shifted over the transmissions in the Dodge and Ford. The interior is the best of the 3.

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  Happy I switched to diesel - 2008 GMC Sierra 2500HD
  By SLC, UT - November 29 - 1:46 am

  I traded in a 2004 F150 4.6L with 25,000 miles to get a 2008 GMC 2500 6.6L diesel. The performance is unreal. I am getting over 13 mpg, which is the same as the 150 on Premium and I get 3 times the power. The ride, fit and finish are as good or better and the information center is a real boon. The shakedown will continue for another six months but for the first 30 days I could not be more pleased.

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  Excellent HD choice & great value - 2008 GMC Sierra 2500HD
  By Dave - August 9 - 1:33 am

  I got one of the first 08 2500HDs off the line as a custom order back in Aug. 07. For what I paid, this truck is an amazing value when compared to the F250s and Ram 2500s out there. The gas V8 has plenty of power and tows a 5000 lb trailer with ease. At first I had a problem with the transmission not downshifting easily in the 25-50 mph range, but the dealer flashed the ECU and now its more responsive (although a bit less smooth- shifting - before it was like silk). Fuel economy has been mostly around 10-11 in the city, anywhere from 12-18 on the highway (the faster you go, the worse it gets). Most impressive is the quality. The interior and overall feel of the 2500HD is very solid.

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  Sharp comfortable work truck - 2008 GMC Sierra 2500HD
  By efflandt - November 24 - 6:10 pm

  I am just approaching its first 1000 miles, so 13.8 ave. mpg of the 6.0L gas engine in wet to snowy suburban/hwy driving may improve in milder/dry weather as it gets broken in. The SLE1 interior trim is a step up from your average work truck with comfortable seats and leather wrapped steering wheel. A smooth quiet ride for a heavy duty truck under most conditions. Feels heavy, but stable and turns on a dime when you want it to. The 26 gal tank may seem limiting, but that is still good for mid-300 mile range, farther than most people would drive without taking a break. Overall it would be hard to find a better truck.

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  One Great Truck - 2008 GMC Sierra 2500HD
  By Big Rob - August 28 - 1:20 pm

  I purchased my 08 in October and now have 5000 miles on it. The fuel economy is around 16 in city and 18 on highway, but I am still in break-in period and expect improvement. Economy drops quickly north of 70 MPH. The Duramax and Allison are a great powerteam and while you can hear it shift, you cannot feel it. Interior on the SLT very well laid our and looks like it should be in a luxury car. The GM 100k warranty is a big plus. My only concern is the 26 gallon fuel tank is too small for hauling heavy trailers.