Nissan on Monday said it would invest $US300 million in a new plant in central Mexico to make advanced fuel-efficient transmissions, Reuters reported. Nissan's transmissions unit Jatco said in a statement it would begin producing continuously variable transmissions (CVTs) from 2005 at the plant in the state of Aguascalientes, the report added, noting that the plant initially would produce 300,000 transmissions a year for the Mexican, US and Canadian markets.