The Grand Cherokee is available with a couple of modern engines. The 5.7-liter Hemi V8 is particularly good for towing or driving at higher elevations. The SRT8 has a 420-hp 6.1-liter Hemi and can accelerate from 0 to 60 mph in less than five seconds. The smaller, 4.7-liter overhead-cam V8 works quite well, however, and the standard overhead-cam V6 is a big improvement over Jeep's old overhead-valve inline-6. New for 2007 are a 3.0-liter turbodiesel V-6 and a flex-fuel 4.7-liter V-8. It comes in four trims: Laredo, Limited, Overland, and SRT8. Safety features that come on all Grand Cherokees include an electronic stability program, four-wheel anti-lock disc brakes with brake assist, traction control, a tire-pressure monitoring system, side-curtain airbags, and front air bags with four levels of deployment.For 2007, the Jeep Grand Cherokee receives a 3.0-liter turbodiesel V-6 and a flex-fuel 4.7-liter V-8 as optional engines.