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GENERAL MOTORS
®
Hydra-Matic 4L30-E automatic transmission
Assembly manual
by
Hans Verhoeven
New Zealand 2008
Revision 1.0 – April 2008
Copyright: Hans Verhoeven 2008.
Nothing in this manual may be copied or reproduced by any means without the written permission of the author.
- 2 -
1.
Index.
1.
Index.
2.
Foreword.
3.
About the author.
4.
About this manual.
5.
History of the 4L30-E transmission.
6.
Tools you need.
7.
In the beginning there is the selector shaft assembly.
8.
Assembly of the internal components.
9.
We’re going to do some planetary indexing on the Ravigneaux . . .
10.
The third clutch assembly.
11.
The sprag race assembly – where it can all go wrong !
12.
The second clutch assembly.
13.
Installation of the 3
rd
clutch into the 2
nd
clutch drum.
26.
The 4
th
clutch assembly.
27.
The oil pump assembly.
28.
Ring the bell, it’s time for the bell housing.
29.
Installation of the convert housing on the adapter case.
30.
The accumulator piston assembly.
31.
The servo piston assembly.
32.
The extension case assembly.
33.
The adapter case valve body.
34.
The main valve body assembly
35.
A word on the mode switch.
36.
Case and associated parts. (illustration)
37.
Case and associated part list.
38.
Pump assembly. (illustration)
39.
Main valve body. (illustration)
40.
Adapter valve body. (illustration)
41.
Overdrive internal components. (illustration)
42.
Internal components. (illustration)
43.
Internal components part list.
44.
Center support assembly. (illustration)
45.
Bushings, Bearings & Washer Locations. (illustration)
46.
Seal locations. (illustration)
47.
Legal talks.
.
Copyright: Hans Verhoeven 2008.
Nothing in this manual may be copied or reproduced by any means without the written permission of the author.
14.
It's now time to determine the "final end play".
15.
Lets get on to the reverse clutch.
16.
The center support assembly.
17.
Installation of the reverse clutch piston.
18.
It’s time for a little MacGyver.
19.
An engagement is coming up.
20.
The overdrive internal components.
21.
Just when you thought your problems were over.... cursing is now allowed.
22.
The overdrive clutch assembly.
23.
It's plate time again !
24.
The overdrive sun gear.
25.
On to that big rod – The turbine shaft
- 3 -
2. Foreword.
This manual is not intended to be a standard work of the HOW-TO reassemble the
General
Motors®
4L30-E transmission, nor is it written with the professional mechanic in the back of my
mind. The reason I wrote it has been solely for my own purpose.
Although realizing that 99.9 % of the people won’t even consider taking a transmission that’s
playing up out of their car let alone disassemble it, it has been a very interesting experience.
Transmissions have always been the field of professionals and hidden with a shroud of mist.
As you can understand I can not take any responsibility of the possible consequences.
Not waving a red flag here. It is certainly possible for a “back yard” mechanic as I am myself to
accomplish a complete rebuild of a complex assembly.
Before you start ask yourself a few questions:
Do I have enough experience or should I stay with changing oil and spark plugs ?
•
Do I have enough time ? (consider at least three to four working days)
•
Do I have enough tools ?
•
Do I have the workspace to arrange all the parts in an orderly manner ?
If the answers on these few questions are positive, go ahead and indulge yourself !
Good luck !
Copyright: Hans Verhoeven 2008.
Nothing in this manual may be copied or reproduced by any means without the written permission of the author.
•
- 4 -
3. About the author.
Born in 1963 in the Netherlands and living abroad in various countries he and his family of five
decided to settle down at the bottom of the earth in New Zealand. That’s where the Isuzu
Trooper, and more specific the 4L30-E transmission, the main subject of this manual were bought.
Part of his education is the Naval Academy in The Netherlands. A career as a seagoing officer
followed. Later he came involved in skydiving, did almost 2000 jumps and was rated as a parachute
rigger.
Hans has always had a keen interest in mechanics and electronics. At the age of seven he devised
his own calculation machine that worked basically with a few clothes pegs from his mother. The
pegs were converted into switches using push pins. Capacitors, some wire and 3 volt light bulbs
completed the part list. After soldering and many hours of trial and error the result was a working
but very limited version of the modern calculator. Pushing the pegs in a certain order gave the
answer to a simple addition. As money was limited the largest number the machine could handle
were equal to the number of light bulbs.
At the age of twelve engines became part of his life. Starting with little 2 stroke 50cc. engines,
becoming bigger and more complex with time.
Throughout his life he was always looking for technical challenges others wouldn’t dare to touch.
There was once an enormous Scania DS14 a 14 liter (855 cu in) V8 diesel engine in his little shed.
The door had to be widened to move it in and out.
His marine career left him with a passion for the oceans. Sailing became his thing. At any stage he
had a smaller or bigger sailboat and later sailing yachts. One of his biggest challenges has yet to
come: building his own 13 meter (43 ft) sailing yacht and circumnavigate the globe.
Nowadays Hans is involved in property maintenance and development.
Dr. J. Havel
Copyright: Hans Verhoeven 2008.
Nothing in this manual may be copied or reproduced by any means without the written permission of the author.
- 5 -
4. About this manual.
Throughout this manual you will find all parts to be written by it’s full name followed by the part
number which correspond with pictures and the drawings at the end of this manual.
For instance:
“Stick the overdrive internal gear 528 on the overdrive carrier assembly 525
”.
Every now and then I tried to make a sensible comment, note or remark. At least describe the way
I managed to accomplish a task. As I’ve written before, these methods, solutions and comments
are based on common knowledge, basic instinct and even some educated guesses. Following these
guidelines will eventually lead you to a working transmission.
I will add one of the following four sign when extra attention is needed.
Info
Note
Stop
Caution
As English is not my first language you have to forgive me the spelling mistakes. They are left in
for people who’s main task in life is correcting them. Also I have given names to certain details
that might not comply with the correct technical term.
Copyright: Hans Verhoeven 2008.
Nothing in this manual may be copied or reproduced by any means without the written permission of the author.
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