GM, Chrysler and Ford C-CLIP rears use straight ROLLER bearings that ride directly on the axle shaft.
Millions of GM, Chrysler and Ford NON C-CLIP (retained wheel bearing type) rears came stock with sealed, single row ball wheel bearings.
Single row ball bearings are MORE common in OEM retained wheel bearing applications than the tapered roller type. I never said ball wheel bearings were stronger than tapered roller wheel bearings.
Most people will never notice a functional difference between the 2 designs.
