This is a genuine AAM driveshaft boot kit for the slip yoke in the rear driveshaft at the carrier bearing. This fits GM and Dodge 3/4 and 1 ton applications from 2003-2018. This boot only fits the AAM driveshaft. Please be aware that Dana made some of the factory drivelines for these trucks as well.
40021327 / 74081327 = ( AAM PN# )
05093380AA / 5093380AA = ( OEM# )