Opel Frontera UBS. Manual - part 2530

7A–78

AUTOMATIC TRANSMISSION (4L30–E)

Overrun Clutch And Turbine Shaft

Disassembled View

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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

7A–79

AUTOMATIC TRANSMISSION (4L30–E)

Disassembly

1. Position overrun clutch assembly upright, using the

overdrive internal gear as a support.

D

Remove snap ring (1).

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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

5–8840–2275–0 (J–23327–91) compressor, then
remove snap ring (8).

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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

D

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.

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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).

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7A–80

AUTOMATIC TRANSMISSION (4L30–E)

2. Install the 5–8840–2269–0 (J–38555) inner installer

on the drum (14).

D

Pre–install piston assembly into 5–8840–2269–0
(J–38555) outer installer.

D

Install overrun clutch piston assembly (13).  Use the
outer installer while pushing piston into drum (14).

D

Remove the installer.

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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.

D

Hold the 5–8840–2275–0 (J–23327–91)
compressor in a vise and compress piston return
spring with compressor.

D

Set snap ring (8) in ring groove.

D

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: Turn the assembly 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).

7A–81

AUTOMATIC TRANSMISSION (4L30–E)

Main Data And Specification

General Specifications

Remarks

Model

THM 4L30–E

Engine

V6 3.5L 6VE1

DOHC

Type

Automatic four speed overdrive in

4th gear lock–up clutch torque

converter

Shift control

Hydraulic

Control systems

Shift pattern

Electronic

Control systems

Shift quality

Electronic

Lock–up clutch

Electronic

1st

2.856

2nd

1.618

Gear ratio

3rd

1.000

4th (O/D)

0.723

Reverse

2.000

Gear set

Noiseless, high torque capability

Oil used

Name

ATF DEXRON



–III

Oil used

Q’ty liter (qt)

8.6 (9.1)

Torque converter

2,100 

±

 150

Stall speed (rpm)

Reverse clutch

RC

4

Second clutch

C2

6

Number of discs

Third clutch

C3

6

Number of discs

Brake band

Double wrap

Fourth clutch

C4

2

Number of discs

Overrun clutch

OC

1

Number of discs

Overdrive

OFW

10

Number of rollers

Principal

PFW

26

Number of sprags

Input sun gear

30

Pinion gear

19

Ravigneaux plan-

Long pinion

23

g

etary gear set

Ring gear

90

Long pinion

19

Number of teeth

Output sun gear

46

O

d i

l

Sun gear

31

Overdrive plane-
tary gear set

Pinion gear

24

tary gear set

Ring gear

81