Results 1 to 3 of 3

Thread: 4l80e segmant swap on 03 trailblazer ext 5.3

  1. #1
    Potential Tuner
    Join Date
    Sep 2020
    Posts
    1

    4l80e segmant swap on 03 trailblazer ext 5.3

    I swapped from a 5.3 and 4l60e to a 6.0 lq4 and 4l80e but I cant find a os that matches mine????????? my os is (12580055) I looked all over and cant find any thing can anybody help???>? heres my tune below
    Attached Files Attached Files

  2. #2
    Tuning Addict 5FDP's Avatar
    Join Date
    May 2012
    Location
    Rogers, MN
    Posts
    13,533
    That's going to be a really tough one because that OS was changed in 2003 to a 12593058 OS and most likely all the 4L80e segments you'd find floating around are that.

    You could maybe email support to see if they have a file or maybe someone by chance happens to have a 12580055 4L80e file to use for segment swapping.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  3. #3
    Advanced Tuner
    Join Date
    Oct 2013
    Posts
    550
    If your 2003 5.3L Trailblazer is still using OS 12580055, then it never received the final software update from a dealership, while still under warranty.

    The 2003 OS software progression is as follows:

    12578128 > 12579405 > 12580055 > 12593058

    The easiest option, to be able to swap in 4L80 segments, would be to have your 2003 P59 PCM updated by a GM dealer - to OS 12593058.

    Then as 5FDP indicated, this newer OS was more widely used by 2003 models - giving you 4L80 segment swap options.