Dodge 2001 Ram 1500 Owner's Manual page 2392

BR/BE
PISTONS (Continued)
Fig. 191 Force Multiplication
Fig. 192 Piston Travel
PLANETARY GEARTRAIN/
OUTPUT SHAFT
DESCRIPTION
The planetary gearsets (Fig. 193) are designated as
the front, rear, and overdrive planetary gear assem-
blies and located in such order. A simple planetary
gearset consists of three main members:
• The sun gear which is at the center of the sys-
tem.
• The planet carrier with planet pinion gears
which are free to rotate on their own shafts and are
in mesh with the sun gear.
AUTOMATIC TRANSMISSION - 47RE
Fig. 193 Planetary Gearset
1 - ANNULUS GEAR
2 - SUN GEAR
3 - PLANET CARRIER
4 - PLANET PINIONS (4)
• The annulus gear, which rotates around and is
in mesh with the planet pinion gears.
NOTE: The number of pinion gears does not affect
the gear ratio, only the duty rating.
OPERATION
With any given planetary gearset, several condi-
tions must be met for power to be able to flow:
• One member must be held.
• Another member must be driven or used as an
input.
• The third member may be used as an output for
power flow.
• For direct drive to occur, two gear members in
the front planetary gearset must be driven.
NOTE: Gear ratios are dependent on the number of
teeth on the annulus and sun gears.
DISASSEMBLY
(1) Remove planetary snap-ring from intermediate
shaft (Fig. 194). Discard snap-ring as it is not reus-
able.
(2) Remove front planetary gear and front annulus
gear as assembly (Fig. 195).
(3) Remove front
washer from front annulus gear (Fig. 196). Note
thrust washer position for assembly reference.
(4) Remove tabbed thrust washer from driving
shell (Fig. 197). Note washer position for assembly
reference.
(5) Remove sun gear and driving shell as assembly
(Fig. 198).
21 - 757
planetary gear and thrust