CAPABILITY QUADRA COIL Tuned with expert precision, Jeep Grand Cherokee's Quadra Coil™ suspension received extensive front refinements, as well as all-new rear components. This affords it the best off-road capability with unsurpassed ride, handling and agility on the most rugged terrain. Equipped with a substantially refined front suspension, Grand Cherokee provides a smoother, quieter ride with less vibration and reduced body lean. How does it work? Let's take a look. The trailing upper arm, dual trailing lower arm and rear stabiliser bar provide symmetrical control of rear axle movement, resulting in a steadier, more comfortable ride. This comes in handy when exploring the rugged charms of a back-country trail. In addition, the track bar geometry (the arrangement of components) is refined for improved ride, while control arms are stiffer for more precise suspension control. This new three-link rear suspension design reduces unsprung weight while moving the roll centre closer to the vehicle's centre of gravity so you can take the occasional bump in the road in your stride.