Page 2369 of 2889

(9) Remove bolts attaching overdrive unit to trans-
mission (Fig. 117).
CAUTION: Support the overdrive unit with a jack
before moving it rearward. This is necessary to pre-
vent damaging the intermediate shaft. Do not allow
the shaft to support the entire weight of the over-
drive unit.
(10) Carefully work overdrive unit off intermediate
shaft. Do not tilt unit during removal. Keep it as
level as possible.
(11) If overdrive unit does not require service,
immediately insert Alignment Tool 6227-2 in splines
of planetary gear and overrunning clutch to prevent
splines from rotating out of alignment. If misalign-
ment occurs, overdrive unit will have to be disassem-
bled in order to realign splines.
(12) Remove and retain overdrive piston thrust
bearing. Bearing may remain on piston or in clutch
hub during removal.
(13) Position drain pan on workbench.
(14) Place overdrive unit over drain pan. Tilt unit
to drain residual fluid from case.
(15) Examine fluid for clutch material or metal
fragments. If fluid contains these items, overhaul will
be necessary.
(16) If overdrive unit does not require any service,
leave alignment tool in position. Tool will prevent
accidental misalignment of planetary gear and over-
running clutch splines.DISASSEMBLY
(1) Remove transmission speed sensor and o-ring
seal from overdrive case (Fig. 118).
(2) Remove overdrive piston thrust bearing (Fig.
119).
Fig. 117 Overdrive Unit Bolts
1 - OVERDRIVE UNIT
2 - ATTACHING BOLTS (7)
Fig. 118 Transmission Speed Sensor
1 - SOCKET AND WRENCH
2 - SPEED SENSOR
3 - O-RING
Fig. 119 Overdrive Piston Thrust Bearing Removal/
Installation
1 - THRUST BEARING
2 - OVERDRIVE PISTON
3 - THRUST PLATE
21 - 734 AUTOMATIC TRANSMISSION - 47REBR/BE
OVERDRIVE UNIT (Continued)
Page 2370 of 2889

OVERDRIVE PISTON
(1) Remove overdrive piston thrust plate (Fig.
120). Retain thrust plate. It is a select fit part and
may possibly be reused.
(2) Remove intermediate shaft spacer (Fig. 121).
Retain spacer. It is a select fit part and may possibly
be reused.(3) Remove overdrive piston from retainer (Fig.
122).
OVERDRIVE CLUTCH PACK
(1) Remove overdrive clutch pack wire retaining
ring (Fig. 123).
(2) Remove overdrive clutch pack (Fig. 124).
(3) Note position of clutch pack components for
assembly reference (Fig. 125).
Fig. 120 Overdrive Piston Thrust Plate Removal/
Installation
1 - OVERDRIVE PISTON
2 - OVERDRIVE PISTON SPACER (SELECT FIT)
Fig. 121 Intermediate Shaft Spacer Location
1 - INTERMEDIATE SHAFT
2 - INTERMEDIATE SHAFT SPACER (SELECT FIT)
Fig. 122 Overdrive Piston Removal
1 - PISTON RETAINER
2 - OVERDRIVE PISTON
Fig. 123 Removing Overdrive Clutch Pack Retaining
Ring
1 - OVERDRIVE CLUTCH PACK RETAINING RING
BR/BEAUTOMATIC TRANSMISSION - 47RE 21 - 735
OVERDRIVE UNIT (Continued)
Page 2371 of 2889
OVERDRIVE GEARTRAIN
(1) Remove overdrive clutch wave spring (Fig.
126).(2) Remove overdrive clutch reaction snap-ring
(Fig. 127). Note that snap-ring is located in same
groove as wave spring.
(3) Remove TorxŸ head screws that attach access
cover and gasket to overdrive case (Fig. 128).
(4) Remove access cover and gasket (Fig. 129).
Fig. 124 Overdrive Clutch Pack Removal
1 - OVERDRIVE CLUTCH PACK
Fig. 125 Overdrive Clutch Component Position -
Typical
1 - REACTION PLATE 3 - PRESSURE PLATE
2 - CLUTCH PLATES (3) 4 - CLUTCH DISCS (4)
Fig. 126 Overdrive Clutch Wave Spring Removal
1 - WAVE SPRING
Fig. 127 Overdrive Clutch Reaction Snap-Ring
Removal
1 - REACTION RING
2 - CLUTCH HUB
Fig. 128 Access Cover Screw Removal
1 - TORX SCREWDRIVER (T25)
2 - ACCESS COVER SCREWS
Fig. 129 Access Cover And Gasket Removal
1 - ACCESS COVER AND GASKET
21 - 736 AUTOMATIC TRANSMISSION - 47REBR/BE
OVERDRIVE UNIT (Continued)
Page 2372 of 2889

(5) Expand output shaft bearing snap-ring with
expanding-type snap-ring pliers. Then push output
shaft forward to release shaft bearing from locating
ring (Fig. 130).
(6) Lift gear case up and off geartrain assembly
(Fig. 131).(7) Remove snap-ring that retains rear bearing on
output shaft.
(8) Remove rear bearing from output shaft (Fig.
132).
DIRECT CLUTCH, HUB AND SPRING
WARNING: THE NEXT STEP IN DISASSEMBLY
INVOLVES COMPRESSING THE DIRECT CLUTCH
SPRING. IT IS EXTREMELY IMPORTANT THAT
PROPER EQUIPMENT BE USED TO COMPRESS
THE SPRING AS SPRING FORCE IS APPROXI-
MATELY 830 POUNDS. USE SPRING COMPRESSOR
TOOL 6227-1 AND A HYDRAULIC SHOP PRESS
WITH A MINIMUM RAM TRAVEL OF 5-6 INCHES.
THE PRESS MUST ALSO HAVE A BED THAT CAN
BE ADJUSTED UP OR DOWN AS REQUIRED.
RELEASE CLUTCH SPRING TENSION SLOWLY AND
COMPLETELY TO AVOID PERSONAL INJURY.
(1) Mount geartrain assembly in shop press (Fig.
133).
(2) Position Compressor Tool 6227-1 on clutch hub
(Fig. 133). Support output shaft flange with steel
press plates as shown and center assembly under
press ram.
(3) Apply press pressure slowly. Compress hub and
spring far enough to expose clutch hub retaining ring
and relieve spring pressure on clutch pack snap-ring
(Fig. 133).
Fig. 130 Releasing Bearing From Locating Ring
1 - EXPAND BEARING LOCATING RING WITH SNAP-RING
PLIERS
2 - ACCESS HOLE
Fig. 131 Removing Geartrain
1 - GEARTRAIN ASSEMBLY
2 - GEAR CASE
Fig. 132 Rear Bearing Removal
1 - OUTPUT SHAFT
2 - REAR BEARING
3 - SNAP-RING
BR/BEAUTOMATIC TRANSMISSION - 47RE 21 - 737
OVERDRIVE UNIT (Continued)
Page 2373 of 2889
(4) Remove direct clutch pack snap-ring (Fig. 134).
(5) Remove direct clutch hub retaining ring (Fig.
135).
(6) Release press load slowly and completely (Fig.
136).
(7) Remove Special Tool 6227-1. Then remove
clutch pack from hub (Fig. 136).
Fig. 133 Geartrain Mounted In Shop Press
1 - PRESS RAM
2 - SPECIAL TOOL C-3995-A (OR SIMILAR TOOL)
3 - CLUTCH HUB
4 - PLATES
5 - PRESS BED
6 - SPECIAL TOOL 6227-1
Fig. 134 Direct Clutch Pack Snap-Ring Removal
1 - CLUTCH HUB
2 - SPECIAL TOOL 6227-1
3 - DIRECT CLUTCH PACK SNAP-RING
4 - PRESS PLATES
5 - CLUTCH DRUM
Fig. 135 Direct Clutch Hub Retaining Ring Removal
1 - SPECIAL TOOL 6227-1
2 - CLUTCH HUB RETAINING RING
3 - PRESS BED
4 - PRESS PLATES
21 - 738 AUTOMATIC TRANSMISSION - 47REBR/BE
OVERDRIVE UNIT (Continued)
Page 2374 of 2889

GEARTRAIN
(1) Remove direct clutch hub and spring (Fig. 137).
(2) Remove sun gear and spring plate. Then
remove planetary thrust bearing and planetary gear
(Fig. 138).(3) Remove overrunning clutch assembly with
expanding type snap-ring pliers (Fig. 139). Insert pli-
ers into clutch hub. Expand pliers to grip hub splines
and remove clutch with counterclockwise, twisting
motion.
(4) Remove thrust bearing from overrunning
clutch hub.
(5) Remove overrunning clutch from hub.
(6) Mark position of annulus gear and direct clutch
drum for assembly alignment reference (Fig. 140).
Use small center punch or scriber to make alignment
marks.
Fig. 136 Direct Clutch Pack Removal
1 - SPECIAL TOOL 6227-1
2 - DIRECT CLUTCH HUB
3 - DIRECT CLUTCH PACK
Fig. 137 Direct Clutch Hub And Spring Removal
1 - DIRECT CLUTCH SPRING
2 - DIRECT CLUTCH HUB
Fig. 138 Removing Sun Gear, Thrust Bearing And
Planetary Gear
1 - PLANETARY GEAR
2 - PLANETARY THRUST BEARING
3 - CLUTCH SPRING PLATE
4 - SPRING PLATE SNAP-RING
5 - SUN GEAR
Fig. 139 Overrunning Clutch Assembly Removal/
Installation
1 - OVERRUNNING CLUTCH
2 - NEEDLE BEARING
BR/BEAUTOMATIC TRANSMISSION - 47RE 21 - 739
OVERDRIVE UNIT (Continued)
Page 2375 of 2889
(7) Remove direct clutch drum rear retaining ring
(Fig. 141).
(8) Remove direct clutch drum outer retaining ring
(Fig. 142).
(9) Mark annulus gear and output shaft for assem-
bly alignment reference (Fig. 143). Use punch or
scriber to mark gear and shaft.
Fig. 140 Marking Direct Clutch Drum And Annulus
Gear For Assembly Alignment
1 - DIRECT CLUTCH DRUM
2 - HAMMER
3 - PUNCH
Fig. 141 Clutch Drum Inner Retaining Ring Removal
1 - INNER RETAINING RING
2 - DIRECT CLUTCH DRUM
3 - ANNULUS GEAR
Fig. 142 Clutch Drum Outer Retaining Ring Removal
1 - OUTER RETAINING RING
Fig. 143 Marking Annulus Gear And Output Shaft
For Assembly Alignment
1 - OUTPUT SHAFT
2 - HAMMER
3 - PUNCH
21 - 740 AUTOMATIC TRANSMISSION - 47REBR/BE
OVERDRIVE UNIT (Continued)
Page 2376 of 2889

(10) Remove snap-ring that secures annulus gear
on output shaft (Fig. 144). Use two screwdrivers to
unseat and work snap-ring out of groove as shown.
(11) Remove annulus gear from output shaft (Fig.
145). Use rawhide or plastic mallet to tap gear off
shaft.GEAR CASE AND PARK LOCK
(1) Remove locating ring from gear case.
(2) Remove park pawl shaft retaining bolt and
remove shaft, pawl and spring.
(3) Remove reaction plug snap-ring and remove
reaction plug.
(4) Remove output shaft seal.
CLEANING
Clean the geartrain and case components with sol-
vent. Dry all parts except the bearings with com-
pressed air. Allow bearings to air dry.
Do not use shop towels for wiping parts dry unless
the towels are made from a lint-free material. A suf-
ficient quantity of lint (from shop towels, cloths, rags,
etc.) could plug the transmission filter and fluid pas-
sages.
Discard the old case gasket and seals. Do not
attempt to salvage these parts. They are not reus-
able. Replace any of the overdrive unit snap-rings if
distorted or damaged.
Minor nicks or scratches on components can be
smoothed with crocus cloth. However, do not attempt
to reduce severe scoring on any components with
abrasive materials. Replace severely scored compo-
nents; do not try to salvage them.
INSPECTION
Check condition of the park lock components and
the overdrive case.
Check the bushings in the overdrive case. Replace
the bushings if severely scored or worn. Also replace
the case seal if loose, distorted, or damaged.
Examine the overdrive and direct clutch discs and
plates. Replace the discs if the facing is worn,
severely scored, or burned and flaking off. Replace
the clutch plates if worn, heavily scored, or cracked.
Check the lugs on the clutch plates for wear. The
plates should slide freely in the drum. Replace the
plates or drum if binding occurs.
Check condition of the annulus gear, direct clutch
hub, clutch drum and clutch spring. Replace the gear,
hub and drum if worn or damaged. Replace the
spring if collapsed, distorted, or cracked.
Be sure the splines and lugs on the gear, drum and
hub are in good condition. The clutch plates and
discs should slide freely in these components.
Inspect the thrust bearings and spring plate.
Replace the plate if worn or scored. Replace the bear-
ings if rough, noisy, brinnelled, or worn.
Inspect the planetary gear assembly and the sun
gear and bushings. If either the sun gear or the
bushings are damaged, replace the gear and bush-
ings as an assembly. The gear and bushings are not
serviced separately.
Fig. 144 Annulus Gear Snap-Ring Removal
1 - OUTPUT SHAFT
2 - ANNULUS GEAR
3 - SNAP-RING
Fig. 145 Annulus Gear Removal
1 - OUTPUT SHAFT
2 - ANNULUS GEAR
BR/BEAUTOMATIC TRANSMISSION - 47RE 21 - 741
OVERDRIVE UNIT (Continued)