TRUCK SERVICE MANUAL
TRANSMISSION
DESCRIPTION AND OPERATION
Para 2-28
Fig. 2-11. Third-gear torque path
f. Third-Gear Operation(fig. 2-11). Engine torque
gear is integral with the sun gear shaft assembly to which
is transmitted through the torque converter as described
the front sun gear is splined. The rotating front sun gear
in a, above. The forward and the second clutches are
rotates the front carrier pinions whose carrier is anchored
applied. The second-clutch application anchors the
against rotating by the applied second clutch. In turn, the
carrier of the front planetary assembly against rot t ion.
rotating front carrier pinions rotate the front ring gear,
The forward-clutch application locks the turbine driven
which, along with the center carrier, is splined to the rear
shaft (input shaft) and the main shaft together so they
planetary through the connecting drum. Since the rear
rotate as a unit. The rear sun gear is splined to both the
carrier hub is splined to the connecting drum on one end
rotating main shaft and the center ring gear and all three
and to the low carrier ring gear on the other end, rotation
parts rotate at input speed. With the carrier of the front
speed of all three components are the same. With the
planetary carrier assembly anchored against rotation (by
low ring gear driving the low planetary pinions and the
second-clutch application), the rotating center ring gear,
low sun gear (which is splined to the rotating main shaft)
rotates the center sun gear shaft via the carrier pinions.
also driving the low pinions, output shaft rotates at a
The center sun
speed reduction of 1. 55: 1.
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