Teraflex Coil Springs Rear 2-Dr 6in / 4-Dr 4in Lift offers a nicely engineered approach for lifted springs of your Jeep Wrangler. Its dynamic balance and excessive rate tuning between the rear and the front-load bias yield coil springs that provide unsurpassed off-road performance and highway handling. TeraFlex chose to utilize the same proven, true and tried linear rate technology that is usually preferred by various car manufacturers including Jeep. That results in having shock valving, pairing and maximum active coils under the load which is stabilized through a full range of predictable handling and suspension movement that meets the needs for your Jeep equipped for off-road traveling. The springs are shot-peened to increase coil spring life by minimizing the spring fatigue and sag. All the Teraflex coil springs are coated with a powder for superior element protection. Against defects, they have a limited lifetime warranty.