CARDONE's extensive experience in testing and engineering CV Drive Axles is the foundation behind our proprietary method of engineering a product that meets and even exceed O.E. performance. We have researched the reasons why original CVs typically fail and designed new solutions to avoid repeat failure. For example, our Neoprene boots are designed with additional bellows, when needed, to resist bellow stress and ozone cracking - the leading cause of boot failure. High-quality grease withstands high-temperature and high-torque demands to ensure long-lasting, reliable performance. Splines are chased to ensure proper fit of CV Drive Axle into the mating hub and transmission, which eliminates installation hassles. Threads are chased to ensure proper fit of the new retaining nut supplied with each CV Drive axle. Additionally, all CV Drive Axle shafts are individually verified for straightness, resulting in vibration-free performance at all speeds.