In selector lever position 1, the front clutch and the rear band are applied.
Application of the rear band locks the planet carrier to the case and powerflow through the gearset in the drive condition is the same as in selector position D 1st gear.
Drive is transmitted through the front clutch to the primary sun gear and through the short and long pinions to rotate the ring gear at the same reduced ratio of 2.39: 1.
However, on overrun full engine braking is provided since the locked planet carrier acts as a reaction member, just as in the drive condition.
In reverse, the rear clutch and the rear band are applied.
The rear clutch application locks the input shaft from the turbine to the secondary sun gear and the rear band locks the planet carrier to the case to provide the reaction member.
Input shaft rotation turns the secondary sun gear clockwise and this causes the secondary pinions to rotate anticlockwise on their pins on the locked planet carrier and turn the ring gear and the output shaft in the reverse direction at a reduced ratio of 2.09: 1.
Full engine braking is also provided on overrun.
