The technical advancements in microprocessors and their incorporation in motor vehicles has led to the feasibility of using continuously variable transmissions in automobiles. This paper discusses the design, development and testing of a rubber V-belt continuously variable transmission for a production vehicle. Overall speed ratios in excess of 7.0 were achieved with a hydraulically actuated driver sheave and a spring and cam loaded driven sheave. The drive was controlled with an 8-bit microprocessor which operated in three different control modes. The test results show that the rubber V-belt is viable for automotive use and has potential for improved fuel economy while maintaining good vehicle drivability.