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Thread: Trans. adapt data

  1. #1
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    Default Trans. adapt data

    Hey guys, I need some help/advice.

    Finished 411 swap on my 1997 GMC, 5.7L with hotcam. My local tuner guy came and did the base tune and after that tried to do the final tune to squeeze out the HP and torque on this girl........
    But we couldn't. For some reason my truck is stuck in second gear. Limp mode?? I had the mechanic at the shop I work at scan my truck and he found that the transmission adapt data is blank.
    Anybody know what the heck I'm looking at here? Obviously, I'm guessing a wiring issue from the swap. I'm just not sure where to start.

    Any help??

    Thanks guys,

  2. #2
    Lifetime Member Doc's Avatar
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    What transmission are you running?

    2000 Silverado Full Size 4x4: Forged 6.2, H/C F1R Procharger
    98A4 Z28: 02 PCM H/C Forged 347, 9" Moser 3.73
    V1 V2 99+up RR COS #5 OLSD Dual Stg N20
    www.efialchemy.com
    www.greatamericancarwar.com

  3. #3
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    Sorry. 4L80E.

  4. #4
    Lifetime Member Doc's Avatar
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    Can you post the tune file. Could be a 4L60 segment while you are attempting to run a 4L80.

    2000 Silverado Full Size 4x4: Forged 6.2, H/C F1R Procharger
    98A4 Z28: 02 PCM H/C Forged 347, 9" Moser 3.73
    V1 V2 99+up RR COS #5 OLSD Dual Stg N20
    www.efialchemy.com
    www.greatamericancarwar.com

  5. #5
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    Do you have power to the transmission? Lack of trons will also cause 2nd gear only.
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

  6. #6
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    Well guys, turns out that my tuner guy flashed the computer for a 4L60E instead of the 80 like my old girl has in it. Now she shifts like a champ.
    One question, though: He mentioned doing an EGR delete on my truck. Any thoughts on this?

  7. #7
    Lifetime Member Doc's Avatar
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    Cool beans on getting the segment swap. EGR. depends on what how your local emissions are enforced? Do you have annual inspections? If not, delete it in the tune and physically remove the EGR. Weld the port shut.

    2000 Silverado Full Size 4x4: Forged 6.2, H/C F1R Procharger
    98A4 Z28: 02 PCM H/C Forged 347, 9" Moser 3.73
    V1 V2 99+up RR COS #5 OLSD Dual Stg N20
    www.efialchemy.com
    www.greatamericancarwar.com

  8. #8
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    Thanks Doc, feels good to have the old girl running again!
    Emissions isn't that crazy up here in sunny Alberta, so deleting wouldn't be an issue that way. Not knowing what the plus and minus is on deleting is my question. What's my benefit and what might be an issue if I delete?
    I've done some reading but I'm getting huge mixed signals.

  9. #9
    Lifetime Member Doc's Avatar
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    EGR, Mheh, ask yourself this, when was the last year GM fitted an EGR on a vehicle? They all eventually get stuck open or closed. I am not an engineer but, I think it is pretty worthless and has no effect on power or fuel efficiency. I think GM did it at the time just to satisfy the Gubment.

    2000 Silverado Full Size 4x4: Forged 6.2, H/C F1R Procharger
    98A4 Z28: 02 PCM H/C Forged 347, 9" Moser 3.73
    V1 V2 99+up RR COS #5 OLSD Dual Stg N20
    www.efialchemy.com
    www.greatamericancarwar.com

  10. #10
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    Thanks Doc, I'll talk to my tuner guy about the delete. I found a delete kit on ebay. That should do the trick.

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