Section III. TORQUE PATHS THROUGH TRANSMISSION

Section III. TORQUE PATHS THROUGH TRANSMISSION

2-23. Torque Path--Low Range

2-22. Torque Path--Neutral

(fig. 2-12)

a. In neutral, drive from the vehicle engine to the

a. Lockup operation (direct drive through the

Transmission range gearing is always through the oil

torque converter) is shown in figure 2-12. However,

in the torque converter. Lockup cannot occur in

converter operation is equally applicable and is

neutral. The converter turbine drives the turbine

always in effect until turbine shaft speed (and front

shaft and the components which are attached to it.

governor speed) is sufficient to cause lockup. Thus,

b. The components attached to the turbine shaft

the vehicle always starts in converter operation

include the high-range c l u t c h housing, in-

regardless of the selector position used.

termediate-range planetary sun gear, and the low-

b. In low range (first gear), the low-range clutch

range planetary sun gear. The power take-off drive

is engaged. This holds the low-range planetary ring

gear, being integral with the high-range clutch

gear stationary. The low-range planetary sun gear

housing, is driven and can drive the power takeoff,

drives the pinions of the low-range planetary

carrier. The pinions must rotate within the

if the transmission is so equipped.

c. No clutches are engaged. Thus, no drive,

stationary ring gear. Their rotation within the ring

except that to a power takeoff, extends beyond the

gear causes the low-range carrier to rotate in the

t u r b i n e shaft. T h e t o r q u e multiplication

same direction as the turbine shaft but at reduced

capabilities and hydraulic drive characteristics of

speed. The carrier, integral with the transmission

the torque converter are available to drive the

output shaft, drives the output shaft.

power takeoff.