Ford-O-Matic was marketed as Merc-O-Matic when installed in Mercury-branded cars.
Ford introduced Ford-O-Matic for the 1951 model year as its first widely used automatic transmission. The three-speed unit was designed by Warner Gear, a division of Borg-Warner, and used a fluid coupling with planetary gearing. It shifted automatically, removing the need for the driver to operate a conventional clutch pedal or manually select each forward gear.
Ford used different marketing names across its brands. Mercury versions were called Merc-O-Matic, while Lincoln applications were marketed as Turbo-Drive. Ford-O-Matic later evolved through related Cruise-O-Matic designs and eventually into the FMX family. These names can be confusing because enthusiasts sometimes use “Cruise-O-Matic” broadly for several related Ford transmissions rather than for one single unit.
The transmission was not the same as SelectShift, which described a manual-selection feature offered on some Ford automatic transmissions. Nor was Turbo-Drive the Mercury name: Turbo-Drive belonged to Lincoln branding. Thus Merc-O-Matic is the specific brand name that identifies Ford-O-Matic in Mercury cars.