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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  A refined, well built truck - 2008 GMC Sierra 2500HD
  By MountainMan - November 11 - 12:26 pm

  Well designed, well built truck that is a pleasure to drive, but it struggles to pull my small 6000lb 5th wheel trailer over some moutain passes. ATF temps up around 215 deg although total weight well within published rating. Front end styling is ugly.

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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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  A Decent Truck With a Poor Drivetrain - 2008 GMC Sierra 2500HD
  By Kevin H - January 10 - 5:33 am

  This is a decent truck, but NOT with the 6.0 and GM 6 speed. You HAVE to get the Duramax if you need a 3/4 ton truck. The gas motor with fly by wire throttle, and GM 6 speed, is a horrible combination. It is a death trap when trying to merge with traffic, especially in conditions when you are on and off the throttle. There is up to a 3-4 second lag where absolutely no throttle input is given to the engine, no matter how hard you press on the accelerator. I believe GM implemented this so their tranny wouldnt explode. The engine and tranny computer work together, and the tranny computer tells the engine computer to not give any throttle until the tranny is ready (it never is).

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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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  Poor Gas Mileage - 2008 GMC Sierra 2500HD
  By Sailer - February 6 - 8:16 am

  9.5 mpg city 10.7 highway. Door handle under armrest is a pain to get to. 5.3 engine would give enough power as I run empty 95% of time Needed 2500 to plow snow. Needs cup holders in dash.

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  2008 GMC 2500 Diesel - 2008 GMC Sierra 2500HD
  By John - December 29 - 11:13 am

  I bought this truck from a local used car dealer. I drive this truck mostly through the mountains of southwestern PA hauling my travel trailer. I previously owned a 2005 F250 diesel. There is absolutely no comparison between the two trucks. This GMC outperforms the ford in every way possible. I never thought I would say this considering my grandfather, my father, and I have been ford guys our entire lives but the proof is in the way the truck drives, handles, pulls, and the reliability I have experienced with this truck. I have driven this truck for more than 15,000 miles and overall I am completely satisfied. I have to say that this is by far the best truck I ever owned.

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  So far, love it. - 2008 GMC Sierra 2500HD
  By Woof - December 27 - 2:56 am

  I bought my 08 SLT, Diesel on New Years eve day, 08. I have put on 17,000 miles mixed mostly highway and suburban with a good bit of weekend warrior hunting and camping trips. I commute in this baby and my combined mileage is 15.7 over the last 9 months. Thats with a cap on the back,and with 35 miles a day in hardcore SF Bay Area highway traffic hell. I dont tow but it will haul a back end load of hunting equipment, dogs and coolers full of meat. Honestly, I could use a lesser truck for most of what I do, but when I need to step up this truck takes it and keeps going. I can stick 3 dogs in the back of the cab, w. seats folded and they ride in comfort and one of them clocks in at 120lbs

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  Transmission/ride - 2008 GMC Sierra 2500HD
  By Craig - September 14 - 9:13 pm

  This truck is by far the worst riding vehicle i have ever owned. I understand it is a HD, but come on GM, youre not always towing with it 100% of the time. I cannot believe the research and development guys at GM designed it that way. The rear end bounces 60% the time when empty or partially empty. tryed changing shocks and tire pressure adjustment. helped out about 5%. The new 6 speed tranmission in my truck needs work. There is a delay in shifting between 2nd and 3rd gear. This happen 10% to 20% of the time but is annoying.When the delay happens engine racing anywhere from 200 rpm to 1000 before the shift takes place.Tranmission engages harshly when shift happens. Look elsewhere.

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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.