JKS Manufacturing Jeep Wrangler JK Rear Coil Spring RetainerRear Coil Spring Retainers are an important safety upgrade for your Jeep Wrangler JK. While longer shocks are likely to increase suspension travel, they can also allow coil springs to become unseated from their axle perches. If you're lucky, you will only be faced with the challenge of reinstalling the errant coil spring in difficult conditions. If you're not so lucky, that dislodged coil spring could bounce around and physical harm or property