GM Genuine Parts Automatic Transmission Wiring Harnesses are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These harnesses protect wires and help secure them against the adverse effects of vibration, abrasions, and moisture. Wire harnesses also optimize the usage of space, helping reduce the risk of shorts. 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).