GM Genuine Parts Rack and Pinion Assemblies are designed, engineered, and tested to rigorous standards, and are backed by General Motors. This assembly converts the rotation of your vehicle's steering column to the side-to-side motion needed to steer the front and, in some cases, rear wheels. 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).