4L60E to 4L80 swap - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum

Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend
User Name
lost password?   |   register now

LinkBack Thread Tools
  #1 (permalink)  
Old 04-24-2013, 08:48 AM
Registered User
Join Date: Apr 2013
Posts: 7
Wiki Edits: 0

Thanks: 2
Thanked 0 Times in 0 Posts
4L60E to 4L80 swap

I have an 05 sierra, the 4l60e sucks and is going downhill. Looked into a new trans and have been doing my research.. One of my teachers tells me you can swap a 4l60e for the 4l80e, with a few modifications. He has not done it himself he says but tells me hes seen people who have. Does anyone know of this swap and can shed light on all the situation and clue me into the changes id need to make to the 4l80e to get it to function properly within the 1500 sierra..

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 04-24-2013, 06:42 PM
Registered User

Last journal entry: T'Bird projectr
Last photo:
Join Date: Nov 2007
Location: Delton, MI
Posts: 209
Wiki Edits: 0

Thanks: 0
Thanked 2 Times in 2 Posts
You'll need to have the ECM reflashed and modify the harness for the new trans. LT1swap.com has pinouts for the harness change. I did the reverse, went from a 4L60 to 4L80 due to the big difference in size of the trans.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 04-24-2013, 08:01 PM
Registered User
Join Date: Apr 2013
Posts: 7
Wiki Edits: 0

Thanks: 2
Thanked 0 Times in 0 Posts
Thanks brother
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 04-30-2013, 05:57 PM
Registered User
Join Date: Dec 2010
Location: Houston, TX
Posts: 417
Wiki Edits: 0

Thanks: 3
Thanked 51 Times in 39 Posts
I have done a few of these conversions.. So, here's a quick list of what *may* need to be changed/modified/altered/replaced:
1. Cooler lines (the later 80's have cooler lines that are spaced farther apart. 97 & later will have this. The earlier ones will have the lines closer together just like the 4L60E, TH-350, TH-700R4. You want the LATER 80e's though (97 & on) as they have some internal GM updates to make them a bit stronger than the predecessors.
2. Cross-member location will change as the mount sits further back on the 80. Think cut, re-weld, or buy after-market or universal cross-member kit.
3. Output shaft on an 80E is LARGER and has a higher spline count so you will need an 80 or TH-400 yoke.
4. Driveshaft length will change as the 80E is longer than the 60.
5. The wiring harness will have to be modified, or purchase an after-market harness, or re-pin the existing harness.
6. The PCM will have to be re-flashed to work properly. We have seen several attempts at local "tuner shops" to modify the 60e program but IT DOES NOT WORK. You MUST reflash the PCM.
7. The floor pan, or transmission tunnel, may have to be "modified" for the larger trans to fit.
8. On some vehicles that have the exhaust cross over, or under, or around, the transmission, the exhaust will have to be cut out for clearance and be re-worked to fit around the trans.
9. On some 80E's there are 2 speed sensors. You only need to connect to the one closest to the rear of the transmission. Your electrical connector may, or may not, reach the speed sensor on the 80E as it is on the drivers side, and the 60E is on the passenger side (1996 & later, earlier 60E's had it on the drivers side as well).

There are a couple things I'm forgetting but I'm in a rush.. Sorry.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 04-30-2013, 06:01 PM
Registered User
Join Date: Dec 2010
Location: Houston, TX
Posts: 417
Wiki Edits: 0

Thanks: 3
Thanked 51 Times in 39 Posts
Also forgot you will need a torque converter as the 60E will not work, filler tube may or may not work, the flex-plate may work with modification (welding, drilling extra holes) or you may need to purchase a specialty adapter flex plate to work with your engine/80E combo...
Reply With Quote Quick reply to this message

Recent Transmission - Rearend posts with photos

Quick Reply

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
4l60e swap bobbed500 Transmission - Rearend 2 08-23-2011 12:22 PM
4l80 swap ojain27 Transmission - Rearend 2 02-22-2011 06:45 PM
4l60e 4x4 To A 4l80 ??? roxxxi Transmission - Rearend 1 11-01-2007 07:54 PM
Need help with 4L80 to th350 swap Jason Transmission - Rearend 0 06-19-2003 08:00 PM
4L80 to TH400 swap Jason Transmission - Rearend 4 06-14-2003 06:46 PM

All times are GMT -6. The time now is 03:43 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.