Here is a compiled listing of the most popular topics discussed here at DieselPlace.com under the 4L80E/4L60E Forum. This is to help you speedily find your answers, without having to wait for a reply to your question. We love to answer questions, and enjoy gathering around the computer to help others out. We’ve all been there. This forum is a living library of information.
Click on the solid underlined word of any topic of interest and it will hyperlink you to the area in the forum where the information was first posted, for example if you click on the underlined word(s) for any topic, this will take you to the thread with information about the topic.
If you don’t find a topic listed, feel free to do a search. You may have to do an individual word or a phrase search, as with any search engine you may need to be creative in describing what you are looking for, don't give up if first search you type comes back with nothing found, there is a entire forum search, & search within a forum sub group, author, subject, date. It may be worth your while to read all FAQ topics 1st so you can inject words or phrases common to the GM 4L80E to help with your searches.
Building the 4L80E FAQ library - If you see a topic that you want to add or think should be added, please paste a link in a PM to any member of Staff.
Thanks and enjoy!
The Diesel Place Staff
Component/System & What Each Affects - For more information Click Here
4L80E Model Year Differences - Explanation of changes to the 4L80E by model year Here
Basic Trouble Shooting:
1. Mechanical vs Electrical Problem - First determine if the problem is mechanical or electrical. Here is how to do this
2. Harsh Shifting/No Up Shifting Into Overdrive - One of the largest concerns frequently mentioned is the dreaded harsh shifting and no up shifting into Overdrive. For trouble shooting information Click Here
Manuals These manuals are .pdf files which will download to your computer when you click on the link:
4L80E Automatic Transmission Rebuild Manual Here
4L80E Transmission Electrical Supplement (GM) Here
4L60E Automatic Transmission Rebuild Manual Here
1994 Transmission Manual: Here
1995 Transmission Manual: Here
1996 Transmission Manual:
1997 Transmission Manual:
1998 Transmission Manual:
1999 Transmission Manual:
Technical Videos
DIY
4L60 Transmission Cooler Upgrade Click Here
Stand Alone Transmission Controller How to build your own Stand Alone Transmission Controller Click Here
Temperature Gauge
Parts List Click Here
FAQs
1
2 - Second Gear Only Condition - See VSS below Or Click
3
4
4WD
_
A
_
B
Block Diagram 4L80E Transmission - Click Here
_
C
Cooler Line Leaks - How to repair transmission cooler line leaks Click Here
Component Slipping - Click Here
Connector Test Points - Transmission connector test point pin locations and what they are for iincluding diagrams and pictures Click Here
Coolant/Moisture In Fluid - Click Here
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D
_
E
Electrical - 4WD
Electrical Component Diagnosis Information - This helps to spell out better the solenoid's roles and electrical/sensor responsibilities in the system. Click Here
Electrical Connection Test Cable Click Here
_
F
Filter - Remote Transmission Fluid Filter See "Remote Transmission Fluid Filter"
4L80E Fluid Change How to do a complete fluid flush Click Here
_
G
Gear Ratio Errors DTC Codes: 85, 86, 87 - What to do if you have these codes Here.
_
H
High Line Pressure causes hard shifts - There are two areas to check: Electrical and Mechanical/Hydraulic. See this reference Click Here
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I
_
J
_
K
_
L
Line Pressure - Transmission Line Pressure - Click Herefor the internal operating conditions.
Low Voltage at Pin E - Verify voltage like this poster ran into. 4L80E Electrical ? 2nd gear only
- Page 3 - Diesel Place : Chevrolet and GMC Diesel Truck Forums Post #22.
_
M
Manual Shift Only - All Gears Work: Click Here
_
N
_
O
OBDI DTC Codes: Click Here
Overdrive - Click Here
_
P
Painless Transmission Controller Documentation This is a .pdf file that will download to your computer when you click on the link Click Here
Pan Bolt Torque - Transmission pan torque specs:
Passthrough Connector - The pins and where they go Click Here
Pressure Control Solenoid (EPC) Test Points at Passthrough Connector - Click Here
_
Q
_
R
Range Pressure Switch (DTC Code 28 Transmission range pressure circuit fault) - Click Here
Remote Transmission Fluid Filter
Reverse Problems
Reverse (Binding In Reverse) - Is there something specific that causes N to be a drive gear? Usually when I experience a bind up in reverse, it is because the forward clutches failed. The forward clutch is on in all forward gears only. When the forward clutches fail they go metal to metal and what you have is too much clearance in the drum causing the forward apply piston to come out of its bore. When this happens, the forward apply piston will not return to the release position and the clutches stay applied no matter what gear you put it in including reverse or neutral.
_
S
Scanners
Sensor and Solenoid resistance table - Click Here.
Shifter - How to fix loose shifter Click Here
Solenoid Locations Picture - Click Here
Solenoid Electrical/Wiring Chart - Click Here
Solenoid Schematics/Wiring - Click Here
Shop Selection/Inspection - Find a transmission shop with the ATRA Logo. Additional information on how to find a good transmission shop Click Here
Speed Sensors - Input and Output - Click Here
_
T
TISS - Transmission input speed sensor
TCC - Torque Converter Clutch - the clutch that locks the tranny instead of passing engine torque through the torque converter. This reduces heat in the transmission and improves fuel economy similiar to a manual transmission. Picture Click Here
Torque Converter Clutch (TCC) - Not Engaging? Click Herefor details.
Torque Converter Clutch Solenoid - Here. How it works Click Here
Torque Converter Shudder: Click Here
TCM Wiring Diagrams - can be found Click Here
Throttle Position Sensor - Mechanical IP - Click Here
TOSS - Transmission output speed sensor
Transfer Case - 4WD
Transmission Fluid Temperature Sensor -
Turbine - Here
_
U
_
V
VSS - Vehicle speed Sensor - Click Here
VSS Buffers This is a .pdf file that will download to your computer when you click on the link Click Here
_
W
Wiring Diagrams
_
X
_
Y
_
Z
Click on the solid underlined word of any topic of interest and it will hyperlink you to the area in the forum where the information was first posted, for example if you click on the underlined word(s) for any topic, this will take you to the thread with information about the topic.
If you don’t find a topic listed, feel free to do a search. You may have to do an individual word or a phrase search, as with any search engine you may need to be creative in describing what you are looking for, don't give up if first search you type comes back with nothing found, there is a entire forum search, & search within a forum sub group, author, subject, date. It may be worth your while to read all FAQ topics 1st so you can inject words or phrases common to the GM 4L80E to help with your searches.
Building the 4L80E FAQ library - If you see a topic that you want to add or think should be added, please paste a link in a PM to any member of Staff.
Thanks and enjoy!
The Diesel Place Staff
Component/System & What Each Affects - For more information Click Here
4L80E Model Year Differences - Explanation of changes to the 4L80E by model year Here
Basic Trouble Shooting:
1. Mechanical vs Electrical Problem - First determine if the problem is mechanical or electrical. Here is how to do this
2. Harsh Shifting/No Up Shifting Into Overdrive - One of the largest concerns frequently mentioned is the dreaded harsh shifting and no up shifting into Overdrive. For trouble shooting information Click Here
Manuals These manuals are .pdf files which will download to your computer when you click on the link:
4L80E Automatic Transmission Rebuild Manual Here
4L80E Transmission Electrical Supplement (GM) Here
4L60E Automatic Transmission Rebuild Manual Here
1994 Transmission Manual: Here
1995 Transmission Manual: Here
1996 Transmission Manual:
1997 Transmission Manual:
1998 Transmission Manual:
1999 Transmission Manual:
Technical Videos
DIY
4L60 Transmission Cooler Upgrade Click Here
Stand Alone Transmission Controller How to build your own Stand Alone Transmission Controller Click Here
Temperature Gauge
- Probe/sensor install Here and Click Here
- TCC Lockup Mod (OBDI ONLY) Click Here
- TCC Lock Up Mod Q&A Click Here
Parts List Click Here
FAQs
1
2 - Second Gear Only Condition - See VSS below Or Click
3
4
4WD
- Electrical - See Electrical - 4WD
- Transfer Case - See Transfer Case
_
A
_
B
Block Diagram 4L80E Transmission - Click Here
_
C
Cooler Line Leaks - How to repair transmission cooler line leaks Click Here
Component Slipping - Click Here
Connector Test Points - Transmission connector test point pin locations and what they are for iincluding diagrams and pictures Click Here
Coolant/Moisture In Fluid - Click Here
_
D
_
E
Electrical - 4WD
Electrical Component Diagnosis Information - This helps to spell out better the solenoid's roles and electrical/sensor responsibilities in the system. Click Here
Electrical Connection Test Cable Click Here
_
F
Filter - Remote Transmission Fluid Filter See "Remote Transmission Fluid Filter"
4L80E Fluid Change How to do a complete fluid flush Click Here
_
G
Gear Ratio Errors DTC Codes: 85, 86, 87 - What to do if you have these codes Here.
_
H
High Line Pressure causes hard shifts - There are two areas to check: Electrical and Mechanical/Hydraulic. See this reference Click Here
_
I
_
J
_
K
_
L
Line Pressure - Transmission Line Pressure - Click Herefor the internal operating conditions.
Low Voltage at Pin E - Verify voltage like this poster ran into. 4L80E Electrical ? 2nd gear only
- Page 3 - Diesel Place : Chevrolet and GMC Diesel Truck Forums Post #22._
M
Manual Shift Only - All Gears Work: Click Here
_
N
_
O
OBDI DTC Codes: Click Here
Overdrive - Click Here
_
P
Painless Transmission Controller Documentation This is a .pdf file that will download to your computer when you click on the link Click Here
Pan Bolt Torque - Transmission pan torque specs:
- 4L80E Click Here
Passthrough Connector - The pins and where they go Click Here
Pressure Control Solenoid (EPC) Test Points at Passthrough Connector - Click Here
_
Q
_
R
Range Pressure Switch (DTC Code 28 Transmission range pressure circuit fault) - Click Here
Remote Transmission Fluid Filter
- Why not to install a remote transmission filter Read This
- If you want to install a remote transmission filter: Read This
Reverse Problems
- Failure - Click Here
- Slipping - Click Here
Reverse (Binding In Reverse) - Is there something specific that causes N to be a drive gear? Usually when I experience a bind up in reverse, it is because the forward clutches failed. The forward clutch is on in all forward gears only. When the forward clutches fail they go metal to metal and what you have is too much clearance in the drum causing the forward apply piston to come out of its bore. When this happens, the forward apply piston will not return to the release position and the clutches stay applied no matter what gear you put it in including reverse or neutral.
_
S
Scanners
- GMScan Tech -
- Tech II - Click Here
Sensor and Solenoid resistance table - Click Here.
Shifter - How to fix loose shifter Click Here
Solenoid Locations Picture - Click Here
Solenoid Electrical/Wiring Chart - Click Here
Solenoid Schematics/Wiring - Click Here
Shop Selection/Inspection - Find a transmission shop with the ATRA Logo. Additional information on how to find a good transmission shop Click Here
Speed Sensors - Input and Output - Click Here
_
T
TISS - Transmission input speed sensor
TCC - Torque Converter Clutch - the clutch that locks the tranny instead of passing engine torque through the torque converter. This reduces heat in the transmission and improves fuel economy similiar to a manual transmission. Picture Click Here
Torque Converter Clutch (TCC) - Not Engaging? Click Herefor details.
Torque Converter Clutch Solenoid - Here. How it works Click Here
Torque Converter Shudder: Click Here
TCM Wiring Diagrams - can be found Click Here
Throttle Position Sensor - Mechanical IP - Click Here
TOSS - Transmission output speed sensor
Transfer Case - 4WD
Transmission Fluid Temperature Sensor -
- How It Works Click Here
- Trouble Shooting Information Click Here
Turbine - Here
_
U
_
V
VSS - Vehicle speed Sensor - Click Here
VSS Buffers This is a .pdf file that will download to your computer when you click on the link Click Here
_
W
Wiring Diagrams
- 1992-1993 4L80E Click Here
_
X
_
Y
_
Z
