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Thread: 6.5 diesel 4l80e in an 03 silverado 4.8

  1. #1
    Tuner in Training
    Join Date
    Oct 2022
    Posts
    23

    6.5 diesel 4l80e in an 03 silverado 4.8

    just finished swapping 4l80e out of a 2000 K3500 2WD 6.5 diesel behind a 2006 turbo 4.8 in a 2003 truck, 3bar OS. Performed everything by the posted steps, install, steps segment swap etc. Surprised to find it lit off and shifted OK rolling around the driveway, on the road it shifts a little abruptly, sounds like its slipping just a bit when taking off from a stop, and I cant manually downshift (automatic downshifts are fine). thought it may be worth asking someone to sanity-check my trans numbers just in case ive bungled something before i got pulling it back out.

    and since im already here im also having issues with going super rich at idle then lean when going into drive then before evening out, changing VE table doesnt seem to do anything, etc, and im out of ideas. disabled maf by the book a dozen times over, split the iat and removed maf altogether, so i dont know what it would be if its even tune related (& not installer error). any advice appreciated, and if im missing any required info lmk and i can get it. Thanks!

    vsracing 78mm 1.25, deka 80s, full 4" turboback, tial 44mm wg, aem truboost, aem regulator @ 58psi, speed max 3bar map, 2002 LR4, 2000 4L80E, 2005 DBW setup (pcm, pedal, throttle body), stock everything else.
    23-01-16 18-06-11.hpl
    23-01-16 15-35-02.hpt

  2. #2
    Potential Tuner
    Join Date
    Feb 2024
    Posts
    1
    Is this stock tuning system