Upgrade your classic GM vehicle's performance with the 1965-1968 Chevrolet Chevelle/El Camino/Monte Carlo/Malibu Transmission Overdrive Solenoid Extension Harness. Designed to seamlessly connect with your existing transmission overdrive harness, this high-quality extension harness ensures optimal functionality and reliability. Say goodbye to wiring frustrations and enjoy smoother shifting and enhanced driving experience compared to alternative wiring solutions.