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Thread: 6l80E TECHM REPLACEMENT PROCESS

  1. #1
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    Default 6l80E TECHM REPLACEMENT PROCESS

    I have searched high and low but can’t find much information for a complete TECHM replacement procedure.

    Does the VIN need to match the PCM? Or is it just a matter of using V8 to Full Flash?

    TECHM is from same Make Model and Year. But I’m getting a no crank issue. Just wondering if it’s the lack of VIN matching as for some reason when using V8 to change VIN it does the process but when I read out it still has the old VIN?

    If it doesn’t need to be linked then I will have to pull pan and check the manual valve and selector switch is ok.
    Last edited by jmsmotorsport; January 14th, 2022 at 06:51 PM.

  2. #2
    Lifetime Member Cougar281's Avatar
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    I don't think it matters, but you should be able to change the VIN with EFILive. I was able to on a 6T70 TECHM.

    Sent from my Pixel 5 using Tapatalk

  3. #3
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    Fun stuff, clear codes and then do the vin

  4. #4
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    Figured it out. In my re assembly I missed lining the manual valve up with the select switch. It now starts but now there’s no line pressure ��*♂️ I may have dislodged a seal between the pump and valve body. Back apart it comes. Got the VIN to work must not have been waiting the required 30secs

  5. #5
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by jmsmotorsport View Post
    ... It now starts but now there’s no line pressure ��*♂️ I may have dislodged a seal between the pump and valve body. Back apart it comes. ...
    Let us know what you find.

  6. #6
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    Quote Originally Posted by joecar View Post
    Let us know what you find.
    Nothing concrete - managed to make pressure by overfilling trans. But would then clunk into drive and reverse - pulled box back out and checked the 35R drum for cracking - no crack but found what I believe is a leak between a seal as when checking for a crack I was getting pressure the other side of one of the pistons. It’s now getting all new pistons, seals and clutches.

  7. #7
    Joe (Moderator) joecar's Avatar
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    AT's involve all or none; nothing in between.

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    Quote Originally Posted by joecar View Post
    AT's involve all or none; nothing in between.
    What do you mean exactly?

  9. #9
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by jmsmotorsport View Post
    What do you mean exactly?
    Reassembly has to be done exactly right (replace all soft parts, test all subassembly's, use the right special tools, no shortcuts), otherwise murphy's law wins.
    Last edited by joecar; January 27th, 2022 at 10:34 PM.

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