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New United Motor Manufacturing, Inc. or NUMMI was the redeployment of the former GM Fremont Assembly plant operated from 1960 to 1982. It was reopened in 1984 in a joint venture between GM and Toyota to manufacturer vehicles for both brands.
GM hoped to learn all about lean manufacturing from the Japanese auto giant and Toyota gained their first U.S. production facility and a chance to try out their approach to the building of automobiles with an American workforce.
The first models produced at the NUMMI plant were the Chevy Nova (1984–1988) followed by the Geo Prizm (1989–1997), the Chevy Prizm (1998–2002) the Hilux (1991–1995) a predecessor to the Tacoma, and the Toyota Voltz, the Japanese right-hand drive version of the Pontiac Vibe.
Both of the Voltz and the Vibe were based on the Toyota Matrix. Production of the Pontiac Vibe was discontinued in August 2009 as GM phased out the Pontiac line.
In addition, from September 1988, the NUMMI plant produced the Toyota Corolla compact car and in 1995, began producing the Toyota Tacoma as well.
Up to May 2010, when the plant closed, NUMMI built an average of 6,000 vehicles a week, or nearly eight million cars and trucks over the lifespan of the joint venture.