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Adding Overdrive to a vehicle

An overdrive will give you an additional gear above the normal high gear in a transmission. Its most common application is to reduce engine RPM on the highway, allowing less wear and tear, noise and improved fuel mileage. Overdrives mostly come one of two two ways:  built into the transmission, (usually as a fourth gear in an automatic or a fifth gear in a stick trans) or as an external, additional gear box. The external overdrive can act as a gear splitter as well as an overdrive. In adding an overdrive to an existing vehicle, there are pros and cons to each method.