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Thread: 4l80e change gear completely opposite to what it should

  1. #1
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    Default 4l80e change gear completely opposite to what it should

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    Need some advice.
    4l80e change gear completely opposite to what it should at light acceleration gives it instantly up to 4 gears or when kickdown in 3 gears it also goes up to 4 gears
    Have logd the sensors
    TOS 7400 rpm
    VSS 100km/h
    TIS 4000rpm
    Eng.rpm 4500rpm
    Have changed the TOS sensor it's same after.

    Br Ponrov
    97 Chevy RCSB 4WD, Internally stock 350 ,stock PCM, 4l60e, Bassani headers catback
    72 Firebird Formula ,engine 70mod 400 Ram air 3 ,0411 Road Runner PCM program Lextech, Lc-2 ,4l80e , axel9"wavetrack 3.91 ,Front rear brakes from gen5. Camaro,

  2. #2
    Joe (Moderator) joecar's Avatar
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    Post tune file.

    Post some logs, including GM.TP.

    Is TP signal ok...?

    What year/model is the vehicle and the donor...?

  3. #3
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    Hi joecar

    thanks for the response and you take the time to help.

    Engine Pontiac 400 RAM Air lll controll with 0411 ECM
    sensors on Engine.
    76MM Throttle Body from L31 5.7 Vortec
    TPS from L31 5.7 Vortec
    Map from L31 5.7 Vortec
    Maf 85mm from Tahoe 2000-2004
    CKP from 1999 2000 24x L21 7.4L 454ci Vortec Gen VI BBC Engines
    CMP Gen IV 24x 58x LS-Series Engines
    ECM 0411 Road Runner
    dual wideband Innovate LC-1 /DLG-1 and Innovate MTXD Etanol /fuel temp both connected to Efilive with Serial cabel , but only one wideband its programed yet.
    4l80e trans from a Truck C3500 2000 year (will be modified with the shift kit from TRANSGO)
    converter std from a Truck C3500 2000 year
    axle 3.89:1
    tire 275/45-18

    400 24x Pontiac, 4L80, ID750 at 58PSI 85mm MAF 4l80e 3.89 275.45.18.ctz29.04.19.3.efi29.04.19.3.efi

    br Ponrov
    97 Chevy RCSB 4WD, Internally stock 350 ,stock PCM, 4l60e, Bassani headers catback
    72 Firebird Formula ,engine 70mod 400 Ram air 3 ,0411 Road Runner PCM program Lextech, Lc-2 ,4l80e , axel9"wavetrack 3.91 ,Front rear brakes from gen5. Camaro,

  4. #4
    Lifetime Member ChipsByAl's Avatar
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    Interesting project, Ponrov. What vehicle did the harness come from? Or did someone build it for you? Is there a 4L60 to 4L80 adapter getting used?
    Al
    "Trash that carb and get Injected!"

  5. #5
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    PAINLESS PERFORMANCE WIRE HARNESS 1996-99 GM VORTEC I have modified after Lexhech wire diagram to convert to 0411 ECM and its repin for the 4l80e transmission connector
    97 Chevy RCSB 4WD, Internally stock 350 ,stock PCM, 4l60e, Bassani headers catback
    72 Firebird Formula ,engine 70mod 400 Ram air 3 ,0411 Road Runner PCM program Lextech, Lc-2 ,4l80e , axel9"wavetrack 3.91 ,Front rear brakes from gen5. Camaro,

  6. #6
    Joe (Moderator) joecar's Avatar
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    In your tune, I see several things...

    the WOT MPH upshift and downshift points are upside down;
    the WOT RPM shift points are wrong.
    the throttle kickdown tables should be 100% all across.

  7. #7
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    Thank you for your feedback.
    Have not studied so much yet, but I will compare tune it with tune to as i found online 2002 Chevrolet Express Van Automatic L31 5.7L 4L80e 2wd (12212156) .

    Br Ponrov
    97 Chevy RCSB 4WD, Internally stock 350 ,stock PCM, 4l60e, Bassani headers catback
    72 Firebird Formula ,engine 70mod 400 Ram air 3 ,0411 Road Runner PCM program Lextech, Lc-2 ,4l80e , axel9"wavetrack 3.91 ,Front rear brakes from gen5. Camaro,

  8. #8
    Joe (Moderator) joecar's Avatar
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    ( some of the tables in some of the tunes are set "incorrectly" from the factory )

  9. #9
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    Hi Joecar
    Thanks for feedback.
    Is there possibility to find a trans. tune(4l80e) that one is sure is right

    Br Ponrov
    97 Chevy RCSB 4WD, Internally stock 350 ,stock PCM, 4l60e, Bassani headers catback
    72 Firebird Formula ,engine 70mod 400 Ram air 3 ,0411 Road Runner PCM program Lextech, Lc-2 ,4l80e , axel9"wavetrack 3.91 ,Front rear brakes from gen5. Camaro,

  10. #10
    Joe (Moderator) joecar's Avatar
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    All the truck trans stock tunes that I've seen (4L60E and 4L80E) had something I didn't like (I was always able to improve upon them).

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