Power for the Commander comes from the choice of a V6 or two different V8 engines. The Sport trim starts with a 210-hp 3.7-liter V6, the Limited gets a 290-hp, flex-fuel 4.7-liter V8 (optional on Sport), and the top-of-the-line Overland has a new-for-2009 5.7-liter V8 Hemi (optional on Limited). A five-speed automatic transmission is standard on all Commanders, with two-wheel drive or one of a range of four-wheel drive systems. Standard safety features include all-row side-curtain air bags, front-impact air bags, anti-lock brakes with brake assist, electronic stability control with roll mitigation and trailer sway control (on models with the tow package.) Standard technology features include Sirius satellite radio and rear parking sensors. Limited and Overland trims include MyGIG entertainment and navigation system with 20-gigabyte hard drive, Boston Accoustic sound system, rear view parking camera, UConnect wireless connectivity,SmartBeam auto-dimming headlights, and memory driver's seat. For 2009, the Commander's available 5.7-liter V8 has been revised and adds variable valve timing. The Limited adds a navigation system and UConnect wireless connectivity. Overland receives Keyless Go passive entry and new high-intensity headlights. Limited and Overland trims add rear heated seats as standard equipment.