2008 GMC Sierra 2500HD Extended Cab - Consumer Reviews

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1 of 1 people found this review helpful
body moulding falling off
By dryan3 on 10/28/12 06:19 AM (PDT)

Vehicle

2008 GMC Sierra 2500HD Extended Cab SLT 4dr Extended Cab LB (6.0L 8cyl 6A)

Review

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. I'm 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. I'm disappointed GMC won't take care of the problem.
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So far, love it.
By Woof on 04/11/10 13:49 PM (PDT)

Vehicle

2008 GMC Sierra 2500HD Extended Cab SLT 4dr Extended Cab 4WD SB (6.0L 8cyl 6A)

Review

I bought my 08 SLT, Diesel on New Year's 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. That's with a cap on the back,and with 35 miles a day in hardcore SF Bay Area highway traffic hell. I don't 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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1 of 2 people found this review helpful
A Decent Truck With a Poor Drivetrain
By Kevin H on 12/27/09 08:35 AM (PST)

Vehicle

2008 GMC Sierra 2500HD Extended Cab SLT 4dr Extended Cab SB (6.0L 8cyl 6A)

Review

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 wouldn't 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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Not a fan
By notafan on 02/13/09 13:41 PM (PST)

Vehicle

2008 GMC Sierra 2500HD Extended Cab SLE1 4dr Extended Cab 4WD LB (6.0L 8cyl 6A)

Review

The fuel economy of this truck leaves a lot to be desired. My truck is GPS'd 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.
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15 months later, still a great truck
By godblesstx on 12/24/08 02:13 AM (PST)

Vehicle

2008 GMC Sierra 2500HD Extended Cab SLE1 4dr Extended Cab 4WD SB (6.0L 8cyl 6A)

Review

This is definitely a Cowboy Cadillac. Performance wise, the gas V8 has all the power you'd need and tows my 7K # trailer with ease. The tranny shifts smooth but as another reviewer said, make sure you get the TCM flash for better kickdown response. The 2500HD 'pure pick up' interior on the SLE not only looks great, it's durable and functional as well. The front seats are great for long road trips. I'm getting about 12 mpg around town and up to 17.5 mpg highway at speeds up to 65. Above that, it nosedives into the 12-14 range. Overall, I'm completely happy with my truck after 15 months. I've had no problems and plan to keep this for a long time.
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A refined, well built truck
By MountainMan on 09/19/08 20:21 PM (PDT)

Vehicle

2008 GMC Sierra 2500HD Extended Cab SLT 4dr Extended Cab 4WD SB (6.0L 8cyl 6A)

Review

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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Excellent HD choice & great value
By Dave on 07/24/08 18:36 PM (PDT)

Vehicle

2008 GMC Sierra 2500HD Extended Cab SLE1 4dr Extended Cab 4WD SB (6.0L 8cyl 6A)

Review

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 it's 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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Poor Gas Mileage
By Sailer on 03/20/08 13:59 PM (PDT)

Vehicle

2008 GMC Sierra 2500HD Extended Cab SLT 4dr Extended Cab 4WD SB (6.0L 8cyl 6A)

Review

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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7 months of ownership & still great!
By GMCcowboy on 03/10/08 14:27 PM (PDT)

Vehicle

2008 GMC Sierra 2500HD Extended Cab SLE1 4dr Extended Cab 4WD LB (6.0L 8cyl 6A)

Review

Bought my 2500HD 4x4 back in August. 8500 miles later, I still love the performance, comfort, and looks of it. I've made one 900+ mile trip towing a 4,000 lb. trailer, and it drove like there was nothing attached to it. The interior comfort is excellent. The seats are very comfy, and the quality is outstanding. I have not had any problems to speak of. I'm real impressed with this truck. The only downside is the gas mileage (to be expected). I average 12/13 in the city, 16-18 highway (depending on speed) and 12.5 towing a trailer on the interstate. Reckon the 6-speed auto helps the MPG a bit.
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Sharp comfortable work truck
By efflandt on 01/12/08 21:32 PM (PST)

Vehicle

2008 GMC Sierra 2500HD Extended Cab SLE1 4dr Extended Cab 4WD SB (6.0L 8cyl 6A)

Review

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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