The AOD transmission is a reliable automatic overdrive unit developed by Ford to improve fuel efficiency and highway performance. Featuring a four-speed design with overdrive, it allows lower engine RPMs during cruising, reducing wear and improving mileage. Commonly used in rear-wheel-drive Ford, Lincoln, and Mercury vehicles, the AOD is valued for its mechanical simplicity and durability. Its hydraulically controlled design makes it easier to service compared to modern electronically controlled transmissions. When properly maintained or replaced with a quality unit, the AOD transmission delivers smooth shifting and dependable performance for daily driving and classic car restorations.
