By KBB.com Editors
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 It 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
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.