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Gear Vendors' overdrive unit is the perfect solution for vintage Mustang owners who want the convenience of overdrive without swapping transmissions. Gear Vendors now has an overdrive for virtually every vintage Ford transmission, including C4, C6, and Top Loader 4-speed. With the Gear Vendors unit, you can shift in and out of overdrive on the fly in gears one, two, three, or four via sophisticated electronics that enables you to engage overdrive manually or automatically based on vehicle speed. The Gear Vendors overdrive works like an automatic transmission, which makes it hydraulic in function with a cone-style clutch pack.