The Chevrolet Avalanche continues to come in both two- and four-wheel drive for 2008. An iron-block 5.3L V8 with 320 horsepower and 340 lb-ft of torque is standard on two-wheel-drive Avalanches, while an aluminum-block 5.3L that provides 310 horsepower and 335 lb-ft of torque is standard with four-wheel-drive. An all-aluminum 6.0L V8 that produces 366 horsepower and 380 lb-ft of torque and utilizes variable valve timing is available regardless of drivetrain, and Active Fuel Management is featured on all 2008 Avalanche engines. Signature features like the Avalanche's midgate system, which allows for flexible hauling capabilities, and bed-mounted storage compartments with drain plugs remain for 2008. Standard equipment on the Avalanche LS include 17-inch aluminum wheels, heated power mirrors, a leather-wrapped steering wheel, cruise control, a CD player, Satellite radio, dual-zone air conditioning, an auto-dimming rearview mirror, and power windows and locks, while the LT trim adds fog lamps and a power driver's seat. The LTZ pours on the upgrades, with a heavy duty locking rear differential, a load-leveling suspension system, 20-inch alloys, auto-dimming exterior mirrors, rear parking assist, rain-sensing wipers, heated windshield washer nozzles, leather seats, power adjustable pedals, automatic climate control, and remote vehicle start. The LTZ's audio system is also a step up, with a six-disc CD changer, Bose speakers, and rear-seat controls. Optional comfort features on the lower trims include an upgraded HVAC system, a remote vehicle starter prep package, and a rearview camera system. The upper trims benefit from an optional touch-screen navigation system and a rear-seat DVD entertainment system with an eight-inch screen. Standard safety features include stability control, side curtain air bags, a tire pressure monitoring system, ABS, and OnStar.