4l80e

  1. dasburb

    1997 K1500 suburban transmission options

    Hi everyone--I read the sticky about transmission compatibility, and I'd like to ask for input about what to do, what it'll cost me, and what the problems might be. Apologies in advance for a long post and thank you if you're reading it. Background: I love my suburban, I take it everywhere (40+...
  2. J

    1996 4L80E P0713 Transmission fluid temp sensor problems

    I have a 1996 Chevy K3500 with the 5.7L and 4L80E I have a P0713 Code. Last weekend I dropped the pan and installed a new internal wiring harness and TFT sensor. I put it all back together and that did not solve my problem. The transmission does not shift at the correct times, but when I clear...
  3. M

    4l80e flakey rev and commanding 4th when in 3rd

    Good evening all. I am having some strange problems with the 4L80E in my 92 6.5L K2500, and I'm looking for some advice. The truck is new to me and has 180K on it, but the trans was rebuilt by a well known local trans shop at 152k. I've rebuilt blown manual transmissions before, but autos are...
  4. J

    4L80E jumping in and out of OD

    I have a 1996 Chevy K3500 5.7l with the 4L80E trans Recently my truck has been having problems shifting at the correct times and sometimes it shifts a little hard. Now when I get to around 50mph it jumps in and out of OD or lockup constantly. The truck has low power, which I am assuming is from...
  5. J

    4l80 manual valvebody No OD and third gear in fourth position

    Couldn’t find anything anywhere else, the issue I’m have is no OD and third gear engages in the OD position (all the way back on B&M pro ratchet shifter)in my reverse pattern manual valvebody 4l80. I’ve had the valvebody off and the fourth clutch engages with air, no gasket between valvebody and...
  6. plskthompson

    4l80 swap questions that I can't find answers to.

    So I've done searches both here and google as well as asked on multiple pages on facebook and have yet to find the answers to a few of the questions I have regarding the 4l80 swap into my 88 c3500. I'll be going from a th400 to the 80. I already have the U.S. Shifts controller I need on order...
  7. J

    Np 243 to 263

    Hello, I am currently in the process of building my 2 door Tahoe. I’m swapping the 350 for a gen vi big block, the 4l60 for a 4l80, and swapping the differentials for those out of an 03 2500 HD. I am hung up on the transfer case though. Its the last piece of the puzzle but I have read that...
  8. D

    All duramax geeks conversion.

    Ok so this may be a longer write up but I would like to get to the bottom of some things hopefully, I have done lots of research but the more I do the less conclusive it becomes... Again sorry for a long write up, I just want to make sure almost everything is thought of and bought/ fabbed up...
  9. Wontonfun

    4L80e trans leaking from "electrical connector"

    95 C3500 chassis cab w/ 7.4L and 4L80e having trouble solving transmission leak. Dealership says it's coming from an electrical connector that ties into my wiring harness between my TISS and TOSS. They said it would probably be an oring but they would have to pull the entire transmission to...
  10. GMC Josh

    91 4l80e trouble code 73

    I have searched all over the web and found a lot of conflicting information on this issue. I have a 1991 GMC 3500HD with a 5.7 and 4l80e and 5.13 rear. It has a jasper rebuilt transmission since before i got it. It shifts hard from 1-2, but shifts smooth in all other gears. It always has a Dtc...
  11. Amsterdamned96

    Pre ‘93 4L80E

    I was handed down a truck with a plethora of electrical gremlins. I’m currently redoing the wiring harness which was damaged in a fire. I’ve read that prior to 95 the 4L80E didn’t have a crank position sensor? I also can’t find one (engine has been pulled by me) is it perhaps integrated into the...
  12. 9

    4L80E problems

    Idk if this is the right spot to ask this. So I did a 5.7 w/4l80E swap on my 94 1500. Since I did the whole swap and got it drivable now the transmission doesn’t want to shift, it’ll get 1 hard shift and that’s it. It won’t down shift after that single up shift. I don’t know what to do anymore...
  13. Zx1000hd

    454 TBI 4l80e FI tech or fast efi install help

    I would like to change to FI tech or fast efi system any tips or pointers. I realize I'll need to change my fuel pump. Mostly wondering how to get my transmission to shift correctly once I remove the TBI. I have a 92 so it is the one year trans plug that isn't common. So doing a trans controller...
  14. M

    Transmission Problem (Need help)

    I'm usually one who does all of my own diagnosing and work on my trucks, however I could use a bit of help on my 96 K2500 5.7/ 4l80e. The fluid in the transmission is red and smells fine, I change the filter and fluid to keep it as healthy as possible. However sometimes it's been having an issue...
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