All parts are manufactured to meet or exceed the original part it is replacing. Bronco differential bearing & seal kits include all bearings and seals necessary to do a differential rebuild and feature: 

•  High-speed bearings that meet ABEC Industry precision standards 
•  Sealed bearings use double or triple lip seals with stainless garter springs to better keep the grease in and the water and dirt out 
•  Premium grease contains rust and oxidation inhibitors