The 2009 Yukon XL Sport Utility vehicle clearly exhibits the GMC spirit `Professional Grade.’ Every Yukon model is engineered for surprising agility and this half-ton model follows in lockstep. The chassis design and coil-spring rear suspension system allow for nimble handling and superior control. Along with a powerful Vortec 5.3L V8 engine and an electronic six-speed automatic transmission (two-or four-wheel drive), this SUV is a bold, forward thinking testament to engineering that is truly Professional Grade.