LO Range-Valves In 1ST Gear Position

With the selector lever in this range, the forward clutch is applied. This delivers turbine torque to the mainshaft and turns the rear internal gear in a clockwise direction. (Converter torque ratio is approximately 2.0 to 1 at stall,

Clockwise motion of the rear internal gear causes the rear pinions to turn clockwise to drive the sun gear counterclockwise. In turn, the sun gear drives the front pinions clockwise, thus turning the front internal gear, output carrier and output shaft clockwise in a reduction ratio of approximately 2.5 to 1. The reaction of the front pinions against the front internal gear is taken by the reaction carrier an roller clutch to the transmission case. (Total stall ratio is approximately 5 to 1).

Downhill or overrun braking is provided in the 1st gear range by applying the rear band, as this prevents the reaction carrier from overrunning the low roller clutch.