The Mercury Grand Marquis is a full-size rear-wheel drive sedan sold by the Mercury division of the Ford Motor Company and manufactured at the St. Thomas Assembly Plant in Canada. It was also built in St. Louis, Missouri until 1985. It is also the only vehicle sold in Canada that still wears a Mercury badge. Power is carried to the rear end by a four-speed electronically-controlled, wide-ratio automatic transmission. This transmission is known as the 4R70W, and is the successor to Ford's AOD and AODE transmissions of the early 1990s.

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