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Thread: 4L80e custom shifting

  1. #1
    Tuner in Training
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    Jun 2019
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    4L80e custom shifting

    Wondering if anyone has put together a file for a 4 L 80 e that does some impressive shift flows as far as shift points based on throttle position and so on and so forth I would be very interested in obtaining a copy of your handiwork if that would be possible.

    Thanks in advance,

    Robert

  2. #2
    Advanced Tuner
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    Sep 2017
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    Not entirely sure what youre looking for but if you download bluecat tool you can input all your information and it will give you shift points based off rpm and speed and a few other things
    1997 30th SS. Torqhead 24x, TFS heads, 234/244 cam, 4l80e, Dana 60.

  3. #3
    Tuner in Training
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    I did the wiring harness from scratch and am not certain if I'm getting into overdrive, I thought that having a file with shift points and speeds would give me a feel for if I was. I put 12 volts to two trans wires, a pink one and a green one. And then I have a green one left marked as tcc brake.

    That blue cat took sounds terrific, I will be checking it out.

  4. #4
    Advanced Tuner Lakegoat's Avatar
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    Jul 2012
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    Maybe you could post your tune and what computer you are using and some more details. Tire size, gear ratio, shift rpm, etc.
    2005 GTO, TrickFlow 225, Magnuson 2300, 4L80, 4 link 8.8
    2013 Silverado 5.3, 6L80

  5. #5
    Tuner in Training
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    Sorry this took so long, vacation, etc.pic.PNG
    here is my buildCYCB-JUN_30_2019_4L80E (1).hpt

    OS: 937337
    trans:16264187

    tires: all 6 tires are LT235x85x16
    rear end gear is a 4:10

    I can say the last shift is done around 60mph
    Last edited by Robertrw3; 2 Weeks Ago at 04:59 AM.

  6. #6
    Tuner in Training
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    Jan 2013
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    Not sure you need a special tune to feel the shift points, if your shifter is still connected in a stock-like manner (P R N D 3 2 1).

    Just put the shifter in 1, and slowly move it up as you drive. You should easily be able to feel the shift from 3rd to 4th when you go from 3 to D if you are going fast enough for the shift to occur (50mph+ on my truck with 33" tires and 3.73 axle). I run around 2000rpm at 70-75mph in 4th, should be 2500-2600 in 3rd but I've never checked. Your rpms will be different with the 4.10s and tire differences though.

    Could also try pulling it from D to 3 while driving 70mph or so, should feel the downshift happen if you were in 4th gear.