Our kit uses a high density polyurethane that mount with your stock rear springs. This eliminates the problem with many systems on the market today for Jeeps.... STIFF springs. Most companies choose the lowest bid when farming out production of their springs which means the customer oftimes gets stuck with a ride that is worse than stock. Our system retains your factory springs so your ride quality and load capacity are not diminished. Notice in the larger shots above, the Rocky Road Rockrails. Forget skidplates, Rocky Road Rockrails are THE most important piece of protection you can add to your Jeep. We also include a full steel outer strut spacer for the front suspension. This lift component mounts outside of the factory strut and so avoids stiffening the suspension. Any kits you might stumble across that use an inside strut spacer will stiffen the vehicle so much as to make this ride quality very uncomfortable. We tried this design with the IFS Jeep strut system and absolutely hated the ride quality. The exterior strut setup doesn't pre-load your spring, so you get full smooth factory ride quality with no worries on ball joint or control arm complications. Our exterior strut design is also a bonus for those do-it-yourselfers who want to try their hand at their own installation. Since our system does not require disassembly of the strut, you can do install the lift in your own driveway with standard hand tools. Our technicians noted that the installation of this lift was actually easier than any other Jeep on the market, including Cherokee, Wrangler, CJ, etc. This is the easiest Jeep on the planet in our opinion to install a lift for, so don't be gun-shy if you want to try your own hand at it. The installation manual is easy to read and comes with photos to follow along with. We know you'll find the Rocky Road 2.25" lift to be the best riding suspension on the market for your Grand Cherokee.