Page 1665 of 2100

7A±81 AUTOMATIC TRANSMISSION (4L30±E)
Inspection And Repair
Visual Check:
If any damage, deformation or wear is found, replace the
damaged part.
Operation Check:
Shake the piston and listen for check ball movement.
Movement indicates proper check ball operation.
Replace the piston if the check ball is missing or falls out.
Reassembly
1. Install piston assembly (10) into the second clutch
drum (11).
Lubricate the lip seal with transmission fluid. Use
the J±23080±A second clutch piston installer to
protect the outer piston lip seal.
NOTE: L ip o f t h e seal should point toward front of
transmission.
Remove the installer.
247RS007
2. Install twenty±two piston springs (9) and spring seat
(8) on the second clutch piston (10). Place retaining
ring (7) onto spring seat.
Use the J±23327 compressor to compress the
piston springs.
NOTE: Do not let spring seat catch in ring groove.
Remove the compressor.
3. Install waved plate (6) and clutch plates (5). Start with
a steel plate and alternate with lined plates.
Align second clutch inner tangs.
4. Install spacer (4), with the fluted end toward clutch
plates.
5. Install retaining ring (3), ring gear (2) and retaining
ring (1).
Page 1666 of 2100
7A±82
AUTOMATIC TRANSMISSION (4L30±E)
3±4 Accumulator Piston
Disassembled View
244RS005
Legend
(1) Snap Ring
(2) Cover(3) Spring
(4) Piston Assembly
Disassembly
1. Install the J±38559±A cover compressor on adapter
case.
Compress piston cover then remove snap ring.
242RS007
2. Install the J±41096 cover remover and J±38584
adapter to center hole of cover.
Use the J±23907 slide hammer to remove cover.
3. Remove spring and piston assembly.
242RW001
Page 1667 of 2100
7A±83 AUTOMATIC TRANSMISSION (4L30±E)
Inspection And Repair
Visual Check:
If any damage, deformation or wear is found, replace the
damaged part.
Reassembly
1. Place the J±38553 piston fitter into adaptor case and
push the piston into position, using suitable diameter
tube.
Remove the piston fitter.
244RS006
2. Install spring and cover.
3. Install snap ring, using the J±38559±A compressor
tool.
Install snap ring in groove.
Remove the compressor tool.
242RS007
Page 1668 of 2100
7A±84
AUTOMATIC TRANSMISSION (4L30±E)
Reverse Clutch Piston And Center Support
Disassembled View
242RY001
Legend
(1) Retaining Ring
(2) Spring Seat
(3) Springs
(4) Piston Assembly
(5) Center Support
(6) Gasket
(7) Transfer Plate
(8) Gasket(9) Restrictor
(10) Retainer Plate
(11) Plug
(12) Spring
(13) Overrun Lock Out Valve
(14) Retainer Plate
(15) Plug
(16) Spring
(17) Reverse Lock Out Control Valve
Disassembly
1. Install the J±23327 compressor tool on spring seat,
then compress the spring seat.
Remove retaining ring (1).
NOTE: Do not over±stress the springs and seat, as this
will cause damage to the spring seat.
Remove the compressor tool.
Page 1669 of 2100

7A±85 AUTOMATIC TRANSMISSION (4L30±E)
247RS008
2. Remove spring seat (2) and springs (3).
3. Remove piston assembly (4).
4. Remove 8 bolts from center support (5), then remove
center support (5) from adapter case.
5. Remove gasket transfer plate/outer support (6),
center support transfer plate (7), and gasket transfer
plate/adapter case (8).
6. Remove restrictor (9) from adapter case housing.
7. Remove retainer plate (10), plug (11), spring (12), and
overrun lock out valve (13) from center support (5).
8. Remove retainer plate (14), plug (15), spring (16) and
reverse lock out valve (17) from center support (5).
Inspection And Repair
Visual Check:
If any damage, deformation or wear is found, replace the
damaged part.
Reassembly
1. Install reverse lock out valve (17) and spring (16) to
center support.
NOTE: Ensure correct assembly of valve. The spring
should be located over the long small diameter end.
2. Install plug (15) and retainer plate (14).
3. Install overrun lock out valve (13) and spring (12) to
center support.
NOTE: Ensure correct assembly of valve. The spring
should be located over the long small diameter end.
4. Install plug (11) and retainer plate (10).
5. Place restrictor (9) in the lube overdrive channel in the
adapter case housing.
242RS005
6. Install gasket transfer plate/adapter case (8), center
support transfer plate (7), and gasket transfer
plate/center support (6).
7. Install center support (5) with 8 bolts.
Torque : 25 Nwm (18 lb ft)
8. Install piston assembly (4) into center support (5).
9. Install twenty four springs (3), spring seat (2), and
retaining ring (1).
Install the J±23327 compressor and compress
spring seat (2) and springs (3), then seat snap ring
(1) in groove.
Remove the tool.
Page 1670 of 2100
7A±86
AUTOMATIC TRANSMISSION (4L30±E)
Overrun Clutch And Turbine Shaft
Disassembled View
252RW005
Legend
(1) Snap Ring
(2) Overdrive Carrier Assembly
(3) Sun Gear
(4) Turbine Shaft
(5) Snap Ring
(6) Backing Plate
(7) Clutch Plates(8) Snap Ring
(9) Overrun Roller Clutch Cam
(10) Roller Clutch Assembly
(11) Overrun Clutch Release Spring Retainer
(12) Diaphragm Spring
(13) Piston Assembly
(14) Overrun Clutch Drum
(15) Turbine Shaft Seal Rings
Page 1671 of 2100

7A±87 AUTOMATIC TRANSMISSION (4L30±E)
Disassembly
1. Position overrun clutch assembly upright, using the
overdrive internal gear as a support.
Remove snap ring (1).
252RS009
2. Remove overdrive carrier assembly (2), sun gear (3)
and turbine shaft (4).
3. Remove snap ring (5), backing plate (6), and clutch
plates (7).
4. Compress diaphragm spring with the J±23327±91
compressor, then remove snap ring (8).
252RS010
5. Remove overrun roller clutch cam (9) and roller clutch
assembly (10).
6. Remove overrun clutch release spring retainer (11)
and diaphragm spring (12).
7. Remove piston assembly (13) from overrun clutch
drum (14).
8. Remove turbine shaft seal rings (15).
Inspection And Repair
Overdrive Carrier Check
Check pinion end play with a feeler gauge.
Clearance: 0.24mm±0.64mm (0.0094in±0.025in)
If clearance is outside specified value, replace overdrive
carrier assembly.
252RS011
Visual Check:
If any damage, deformation or local wear is found,
replace the damaged part.
Reassembly
1. Install turbine shaft seal rings (15) with grease
(petroleum jelly).
241RS008
Page 1672 of 2100

7A±88
AUTOMATIC TRANSMISSION (4L30±E)
2. Install the J±38555 inner installer on the drum (14).
Pre±install piston assembly into J±38555 outer
installer.
Install overrun clutch piston assembly (13). Use the
outer installer while pushing piston into drum (14).
Remove the installer.
252RS012
252RS013
3. Install diaphragm spring (12).
4. Install overrun clutch release spring retainer (11) (lip
faces upwards), overrun roller clutch assembly (10),
and cam (9).
5. Place snap ring loosely on spring retainer.
Hold the J±23327±91 compressor in a vise and
compress piston return spring with compressor.
Set snap ring (8) in ring groove.
Remove the compressor.
6. Install clutch plates (7), start with steel plate and
alternate with lined plates.
7. Install backing plate (6).
8. Install snap ring (5).
9. Install overdrive sun gear with countersink pointing
downwards.
10. Install the overdrive carrier assembly (2).
NOTE: Tu r n t h e a s sembly in a counter±clockwise
direction only until roller clutch enters the outer race.
After installation, rotate the assembly and listen for loose
rollers.
11. Install turbine shaft (4) and snap ring (1).