Jeep added a second midsize sport-utility vehicle for 2006, sharing its basic architecture with the Grand Cherokee. Seating seven, the Commander was 2 inches longer overall than the Grand Cherokee, which seated five. With the new Commander, Jeep competed against the Dodge Durango, Ford Explorer, and Toyota 4Runner. Base and Limited models were offered. Standard on the base model was a 210-horsepower, 3.7-liter V6. Standard on the Limited and optional for the base Commander was a 235-horsepower, 4.7-liter V8. Available for the Limited was Chrysler's 330-horsepower 5.7-liter Hemi V8. The 5.7 had Chrysler's Multi-Displacement System, which deactivated four cylinders at idle and during cruising, to save fuel. Commander's sole transmission was a five-speed automatic with manual-shift capability. V6 and 4.7-liter V8 models could have either rear- or all-wheel drive. The Hemi V8 came only with AWD. Each V8 used its own AWD system, but both included low-range gearing (which was unavailable for the AWD V6). AWD V8s offered optional front and rear limited-slip differentials. All Commanders had antilock four-wheel disc brakes, tire-pressure monitor, 17-inch wheels, rear obstacle detection, and a rear liftgate with separate-opening glass. An antiskid system with rollover sensors was standard. Standard curtain side airbags provided head and torso protection for the first and second seating rows. Other options included rear DVD entertainment and Chrysler's UConnect, which used the audio system as a hands-free wireless link to cell phones. Also available were a navigation system, power-adjustable pedals, heated front seats, satellite radio, and an off-road package.