Hendrickson air springs are designed and tuned specifically for approved applications. Choosing an air spring other than the original can alter the performance of a suspension. Variations in internal bumpers and flexmember bias can affect how much weight is carried by a given amount of air, which could mean a front axle in a tandem weighs out differently from the rear. Ride quality and performance are key factors when designing the internal make-up of Hendrickson air springs. A low natural frequency is achieved through proprietary piston and bump stop components. Hendrickson air springs undergo advanced design and testing processes to provide enhanced suspension ride, handling and performance. That's why it's important to spec only Hendrickson Genuine Parts air springs.