So this is where GM is hiding the real good stuff, namely a 6.2-liter V8 engine that makes 400-horsepower at 5,700 rpm and 417 lb.-ft. of torque at 4,300 rpm, and is coupled to a six-speed automatic transmission and either two-wheel drive or all-wheel drive. It also features a 9.5-inch rear axle (2WD) or 8.6-inch rear axle (AWD) with 3.42 gears and a locking rear differential. Standard chassis features include a heavy-duty Z85 suspension, four-wheel disc brakes and StabiliTrak, along with skid plates and tow hooks. Eighteen-inch aluminum wheels are standard and unique 20-inch chrome-finish aluminum wheels are available. The wheel designs are unique to the Denali.