For 2015, the GMC Yukon is getting an all-new look and borrowing the chassis and engine from the GMC Sierra, a truck that was entirely revamped last year. The Yukon is available with a regular or extended (XL) wheelbase. Its 5.3L V8 produces 355 horsepower while the luxurious Denali’s 6.2L V8 generates 420 horsepower. All engines are paired with a six-speed automatic gearbox. They’re available in RWD or AWD.