![]() ![]() "The reason we go to more gears is so we can operate at or near the optimal point of the engine," said Mike Solt, FCA's director of automatic transmissions. ![]() This makes for extremely responsive throttle and smooth shifting, not to mention quick downshifting and more options for the transmission to choose from, allowing it to be as efficient as possible, while remaining close to peak performance within moments. ![]() The small gears in higher-gear transmissions allow the engine to stay extremely close to the top of each gear when in operation. "You have both plays: the fuel economy, and the shift feel." "So for the customer, the transmission becomes very precise, very smooth shifting," Kline said. This results in making the steps shorter, which takes a tremendous energy out of the shift, thus taking the disturbance out. As you put more gear ranges in a transmission, the overall ratio range becomes limited, so you end up making the gears shorter. General Motors invested $323-million in a new facility in Romulus, Mich., to develop their latest high-gear transmission.įuel economy played a big role in increasing the number of gears, said Scott Kline, assistant chief engineer for the Hydra-Matic nine-speed automatic transmission. The Purpose of a Higher-Gear Transmission Photo of the ZF 9HP courtesy of ZF Friedrichshafen. ![]()
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