In order to meet stricter emissions standards, automakers are scrambling for any efficiency gain they can get in internal-combustion engines and powertrains. One of the most popular options for increasing efficiency is transmissions with a greater number of gears. Where 6-speed transmissions were once considered more than adequate, now seven... GM debuts 9-speed automatic, offering 2-percent efficiency improvement
In order to meet stricter emissions standards, automakers are scrambling for any efficiency gain they can get in internal-combustion engines and powertrains. One of the most popular options for increasing efficiency is transmissions with a greater number of gears. Where 6-speed transmissions were once considered more than adequate, now seven...