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From underneath you can see how the Gear Vendors unit mounts to the end of the transmission. Installation of the overdrive took less than a day, and it really makes a difference. At freeway cruising speed it dropped the rpm from 3,000 to 2,000! In the manual setting, your three-speed automatic can be turned into a six-speed.
1957 Chevrolet Project Part XIV: The Finished Product

From underneath you can see how the Gear Vendors unit mounts to the end of the transmission. Installation of the overdrive took less than a day, and it really makes a difference. At freeway cruising speed it dropped the rpm from 3,000 to 2,000! In the manual setting, your three-speed automatic can be turned into a six-speed.  View Related Article