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 11 through 20 of 27.00

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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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  body moulding falling off - 2008 GMC Sierra 2500HD
  By dryan3 - February 14 - 5:45 pm

  My 2008 GMC diesel pickup has 41.000 miles and has been a good truck. However it will be 5 years old in December, and the body moulding on each side is loose and starting to fall off. The dealer said it is a common problem, but since it is out of warranty they would not fix it. I went to a body shop, and the person there said it is a common problem with that body style. He said a solution is to remove the moulding and glue and buff out the paint. His estimate was $240.00. Im disgusted that this problem should occur on a $40,000 vehicle. I see 25 year old cars and trucks with the body moulding still intact. Im disappointed GMC wont take care of the problem.

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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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  GMC Sierra 2500HD 4WD 6.6L - 2008 GMC Sierra 2500HD
  By James Nichols - October 4 - 5:43 pm

  First off, after researching diesel trucks for over a year, it was clear that the Duramax/Allison power train was the "gold standard". I recently installed a Banks air intake, programmer, and exhaust system ($2500) and the performance is startling. Stock, average fuel economy was 16.2 (70 mph+ freeway); I hope the Banks package increases that up to 2 mpg. I stopped to watch a local, weeknight rodeo event in Paso Robles, CA and there were eventually 40+ trucks with 20-30 trailers, all diesels: 1 Chev, 3 Fords, the rest GMCs.

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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.

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  Duramax/Allison combo is a beast! - 2008 GMC Sierra 2500HD
  By Mark - October 28 - 10:36 pm

  This vehicle was a replacement for a 2005 2500HD Duramax SLE and the engines are nothing alike. The new Duramax and six speed Allison is quieter, smoother and the towing power is incredible. We are towing a 35 foot travel trailer and it is like theres nothing behind you. The Z71 package does increase the stiffness but the ride is excellent. The interior rivals my 07 Denali. If you gotta tow, this is the one to buy.

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  Not a fan - 2008 GMC Sierra 2500HD
  By notafan - September 9 - 9:13 am

  The fuel economy of this truck leaves a lot to be desired. My truck is GPSd so I am only able to drive the speed limit without getting in trouble. The best I have ever got for fuel economy is 14.8 mpg (imperial gallons). The quality of the truck is less than desirable. In cold weather (less than -20c) the back doors will not latch completely without slamming them hard. I actually knocked the molding off the door trying to get it latched. When the doors are closed they squeak and rattle so bad you have to turn the radio up. I have had to install a second battery to get the truck to start after sitting for more than 3 days. The airbag computer already stopped working and needed replacing.