Beginning in August 1980, the six-cylinder 2.8-liter diesel was added to the Van and Wagon models in Japan. A lock-up torque converter was added to the four-speed automatic transmission, which was added in June 1982. This new transmission gave considerably better fuel economy, but did necessitate altering the floor plate to provide a wider transmission tunnel. At this time, the L20-engined van received a version of the engine which met the 1981 emissions standards; this model received the new chassis code V431. In February 1983, the "Excellence" trim was added to help sell the last 430 cars before the introduction of the new Y30, fitted with either the turbocharged or the fuel injected L20 engine. This model approached the top Brougham's trim, but in a lower tax bracket and with special two-tone paint.