Fitment: Silverado 2500 HD 6.0L 2015-2019 Silverado 2500 HD 6.6L 2015-2020 Silverado 3500 HD 6.0L 2015-2019 Silverado 3500 HD 6.6L 2015-2020 GMC Sierra 2500 HD 6.0L 2015-2019 GMC Sierra 2500 HD 6.6L 2015-2020 GMC Sierra 3500 HD 6.0L 2015-2019 GMC Sierra 3500 HD 6.6L 2015-2020 Features Benefits: To ensure proper fit. Axle is 100% measured after assembly. Threads are rolled with precision to ensure proper fit when installing the axle nut. Boot clamps are pneumatically compressed to create a perfect seal between the boot and housing. We Select Engineered (CSE) technology ensures that all CV axles meet or exceed OE form, fit and function. High-quality grease withstands high temperatures and high torques to ensure long, reliable operation. Transmission seal diameters are precision machined after heat treating to ensure proper surface finish for long seal life. Splines are precision rolled to ensure proper fit of the axle into the mating hub and transmission, eliminating installation issues. 100% neoprene boots are designed with extra bellows to resist bellows stress and ozone cracking, a leading cause of boot failure.