4WD. Flex Fuel! Come to the experts! If you've been longing for just the right 2008 GMC Sierra 1500, then stop your search right here. This is the ultimate truck that is guaranteed to fit your needs. This Sierra 1500 is nicely equipped with features such as 4WD. Completely redesigned and reengineered the previous year, this Sierra SLE1 offers segment-leading fuel economy thanks to the Active Fuel Management-equipped 5.3L V8 engine that cuts the operation of four cylinders when they are unneeded. Designated by Consumer Guide as a Recommended Large Pickup in 2008. The right way, the Honda of Lincoln way!