These TeraFlex Outback coil springs have received the best attention and consideration concerning the spring rate development and tuning. Those dedicated to overland travel know that their Jeep requires specific spring rates suited to heavier loads and continuous mechanical resonance, which work better than factory springs. TeraFlex engineered heavy-duty load-enhanced spring rate coils meet performance demands of the fully loaded Jeep, while maintaining lift heights. Due to the load enhanced spring rate, passengers will experience a firmer ride with empty payloads. TeraFlex linear coil springs will provide perfectly engineered approaches to lifted springs for most Wrangler models. The extensive dynamic balance and rate tuning between rear and front load biases produce a coil spring system that delivers unsurpassed off road performance and highway handling. TeraFlex chose to use the same tried and true, proven linear rate technology preferred by the Jeep company. This results in a maximum in active coils under even the heaviest loads, with shock valving and pairing consistent through a full range of motion and suspension movement. The predictable handling meets all Jeep requirements for off road vehicle travel. The TeraFlex coild springs are all shot peened, reducing fatigue and spring sag, to increase overall coil spring life. TeraFle coil springs are also powdercoated for superior element protection.