GM Genuine Parts Differential Drive Pinion Gear Seals are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These seals help ensure differential fluid does not leak out of your vehicle's differential, and are GM-recommended replacements for your vehicle's original components. 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).