Jeep Wrangler TJ. Manual — part 488
SECOND GEAR POWERFLOW
Second gear is achieved by having both planetary
gear sets (Fig. 4) contribute to torque multiplication.
As in first gear, torque input is through the under-
drive clutch (1) to the rear sun gear. The 2/4 clutch
(2) is applied to hold the front sun gear stationary.
The rotating rear sun gear turns the rear planetary
pinions. The rear pinions rotate the rear annulus/
front carrier assembly. The pinions of the front car-
rier walk around the stationary front sun gear. This
transmits torque to the front annulus/rear carrier
assembly, which provides output torque and a gear
ratio of 1.57:1.
Fig. 4 Second Gear Powerflow
1 - UNDERDRIVE CLUTCH APPLIED (Turns Rear Sun)
2 - 2-4 CLUTCH APPLIED (Holds Front Sun)
21 - 42
AUTOMATIC TRANSMISSION - 42RLE
TJ
AUTOMATIC TRANSMISSION - 42RLE (Continued)
THIRD GEAR POWERFLOW
In third gear, two input clutches are applied to pro-
vide torque input: the underdrive clutch (1) (Fig. 5)
and overdrive clutch (2). The underdrive clutch
rotates the rear sun gear, while the overdrive clutch
rotates the front carrier/rear annulus assembly. The
result is two components (rear sun gear and rear
annulus gear) rotating at the same speed and in the
same direction. This effectively locks the entire plan-
etary gearset together and is rotated as one unit. The
gear ratio in third is 1:1.
Fig. 5 Third Gear Powerflow
1 - UNDERDRIVE CLUTCH APPLIED (Turns Rear Sun)
2 - OVERDRIVE CLUTCH APPLIED (Turns Front Carrier/Rear
Annulus)
TJ
AUTOMATIC TRANSMISSION - 42RLE
21 - 43
AUTOMATIC TRANSMISSION - 42RLE (Continued)
FOURTH GEAR POWERFLOW
In fourth gear input torque is through the over-
drive clutch (1) (Fig. 6) which drives the front carrier.
The 2/4 clutch (2) is applied to hold the front sun
gear. As the overdrive clutch rotates the front carrier,
it causes the pinions of the front carrier to walk
around the stationary front sun gear. This causes the
front carrier pinions to turn the front annulus/rear
carrier assembly which provides output torque. In
fourth gear, transmission output speed is more than
engine input speed. This situation is called overdrive
and the gear ratio is 0.69:1.
Fig. 6 Fourth Gear Powerflow
1 - OVERDRIVE CLUTCH APPLIED (Turns Rear Sun)
2 - 2-4 CLUTCH APPLIED (Holds Front Sun)
21 - 44
AUTOMATIC TRANSMISSION - 42RLE
TJ
AUTOMATIC TRANSMISSION - 42RLE (Continued)
REVERSE GEAR POWERFLOW
In reverse, input (Fig. 7) power is through the
reverse clutch (1). When applied, the reverse clutch
drives the front sun gear through the overdrive hub
and shaft. The L/R clutch (2) is applied to hold the
front carrier/rear annulus assembly stationary. The
front carrier is being held by the L/R clutch so the
pinions are forced to rotate the front annulus/rear
carrier assembly in the reverse direction. Output
torque is provided, in reverse, with a gear ratio of
2.21:1.
Fig. 7 Reverse Gear Powerflow
1 - LOW-REVERSE CLUTCH APPLIED (Holds Rear Annulus Front
Carrier)
2 - REVERSE CLUTCH APPLIED (Turns Front Sun)
TJ
AUTOMATIC TRANSMISSION - 42RLE
21 - 45
AUTOMATIC TRANSMISSION - 42RLE (Continued)
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