Grand Cherokee 4WD V8-4.7L (2003)
Three hydraulically applied input clutches are used to drive planetary components. The underdrive, overdrive, and reverse clutches are considered
input clutches and are contained within the input clutch assembly (Fig. 68) and (Fig. 69). The input clutch assembly also contains:
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Input shaft
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Input hub
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Clutch retainer
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Underdrive piston
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Overdrive/reverse piston
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Overdrive hub
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Underdrive hub
OPERATION
The three input clutches are responsible for driving different components of the planetary geartrain.
UNDERDRIVE CLUTCH
The underdrive clutch is hydraulically applied in first, second, second prime, and third (direct) gears by pressurized fluid against the underdrive
piston.
When the underdrive clutch is applied, the underdrive hub drives the input sun gear.
OVERDRIVE CLUTCH
The overdrive clutch is hydraulically applied in third (direct), fourth, and fifth gears by pressurized fluid against the overdrive/reverse piston. When
the overdrive clutch is applied, the overdrive hub drives the reverse carrier/input annulus assembly.
