Cross section of an automatic transmission.
1 - cross-axle differential, 2 - intermediate drive gear, 3 - intermediate gear shaft (gearbox output shaft), 4 - rear cover, 5 - overdrive clutch, 6 - reverse clutch, 7 - second gear brake, 8 - first and reverse brake, 9 - overrunning clutch, 10 - underdrive clutch, 11 - lockup torque converter clutch, 12 - torque converter, 13 - automatic transmission pump.