GM Genuine Parts Differential Drive Pinion Gear Seal Kits are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These kits contain necessary parts to install a differential drive pinion gear seal, and are GM-recommended replacements for your vehicles original components. These seals help ensure differential fluid does not leak out of our vehicles differential. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).