Fig. 9: 4th Gear Power Flow
Courtesy of CHRYSLER LLC
In Fourth gear, the UD (1) and OD clutches (2) are applied to provide input torque. The UD hub is splined to
the rear sun gear. When the UD clutch is applied, the UD hub and rear sun gear are driven. The OD hub
assembly is splined to the front carrier/rear annulus assembly. When the OD clutch is applied, the OD hub and
front carrier/rear annulus assembly are also driven. With the rear sun gear and the rear annulus driven at the
same speed and in the same direction, the entire front/rear planetary gear train is locked and rotating as one unit.
The rear carrier/front annulus rotates as an output member in direct, or 1:1.
Power from the main centerline transfers to the underdrive compounder annulus by way of the transfer gears
and the underdrive shaft. The Overrunning Clutch (ORC) (4) holds the underdrive sun gear. The LC (3) is also
applied during coast in first gear. With the sun gear held, the annulus drives the underdrive compounder carrier,
and a reduction gear ratio of 1.45:1 is achieved by the underdrive compounder gear set.
The main centerline ratio of 1:1 is multiplied by the underdrive compounder centerline ratio of 1:45. As a result,
the ratio through the entire gear train to the final drive in Fourth gear is 1.45:1.
FIFTH GEAR
2009 Chrysler Town & Country LX
2009 AUTOMATIC TRANSMISSION 62TE - Service Information - Grand Caravan, Town & Country
steve
Monday, May 23, 2011 1:26:07 PM Page 10 © 2006 Mitchell Repair Information Company, LLC.
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