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Thread: T42 4l70e to 4l80e segment swap

  1. #1
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    Default T42 4l70e to 4l80e segment swap

    so, i had the pcmforless/tuned by frost trans conversion harness and did not like the fact that there is no iss, so i pulled the harness off, and re-pinned my stock harness plug and added an external iss wires and plug. My question is: do i need to find a 4l80e tune with the same os # as what my 4l70e tune os to do a segment swap and have it work?
    2001 2500hd dmax/allison plow truck, stock.
    2002 2500hd dmax/allison, billet wheel s366, sc4 trans. 12.59 1/4 mile. 626rwhp/1015rwtq
    2007 TBSS-AES 390/4l80e, FI billet wheel s480, 801rwhp/684rwtq on 17psi with e85

  2. #2
    Joe (Moderator) joecar's Avatar
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    Yes.

    And the harness needs a minor repinning.

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    Quote Originally Posted by dmaxvaz1978 View Post
    ... My question is: do i need to find a 4l80e tune with the same os # as what my 4l70e tune os to do a segment swap and have it work? ...
    It is always beneficial to post your tunes (ECM & TCM), to assist with obtaining a specific answer to your question, rather than a generalized response.

    If this question is regarding the 2007 TBSS in your signature, these used a unique TCM OS, and there is no corresponding 4L80 calibration.

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    Quote Originally Posted by Taz View Post
    It is always beneficial to post your tunes (ECM & TCM), to assist with obtaining a specific answer to your question, rather than a generalized response.

    If this question is regarding the 2007 TBSS in your signature, these used a unique TCM OS, and there is no corresponding 4L80 calibration.
    are you saying i cant get a 4l80e tune to do this? i wired the harness at the tcm and at the trans like a 4l80e. I tried to flash a 4l80e tune in it last night, and it didnt work. i need to look up the os and post it. i am a little green when its about anything computers. from what i have read, a T42 tcm from a 2008 6.0/4l80e van should work
    Last edited by dmaxvaz1978; April 7th, 2014 at 02:49 AM.
    2001 2500hd dmax/allison plow truck, stock.
    2002 2500hd dmax/allison, billet wheel s366, sc4 trans. 12.59 1/4 mile. 626rwhp/1015rwtq
    2007 TBSS-AES 390/4l80e, FI billet wheel s480, 801rwhp/684rwtq on 17psi with e85

  5. #5
    Joe (Moderator) joecar's Avatar
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    Taz is saying that there is no 4L80E file for your context.

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    Quote Originally Posted by dmaxvaz1978 View Post
    are you saying i cant get a 4l80e tune to do this? i wired the harness at the tcm and at the trans like a 4l80e. I tried to flash a 4l80e tune in it last night, and it didnt work. i need to look up the os and post it. i am a little green when its about anything computers. from what i have read, a T42 tcm from a 2008 6.0/4l80e van should work
    When you come to this Forum asking for assistance, the onus is on you to provide any / all information necessary for correct answers to be formulated.

    You were directed to post your tune files - which you have not done.

    My answer in post #3 had to employ the "crystal ball" approach - guessing what vehicle you were referencing by looking at those listed in your signature.

    Also, my answer in post #3 was in response to YOUR question - regarding a segment swap.

    You are now asking about using a completely different OS, from a completely different vehicle - which is a completely different question.

    Post your tunes ... describe the vehicle these questions reference ... and perhaps we can provide you with some reasonable options.

    Just a little tip regarding Forum decorum ... if getting the necessary information from a posting person becomes like pulling teeth, then odds are that person will not get much support.
    Last edited by Taz; April 7th, 2014 at 04:03 AM. Reason: - typo

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    Quote Originally Posted by Taz View Post
    When you come to this Forum asking for assistance, the onus is on you to provide any / all information necessary for correct answers to be formulated.

    You were directed to post your tune files - which you have not done.

    My answer in post #3 had to employ the "crystal ball" approach - guessing what vehicle you were referencing by looking at those listed in your signature.

    Also, my answer in post #3 was in response to YOUR question - regarding a segment swap.

    You are now asking about using a completely different OS, from a completely different vehicle - which is a completely different question.

    Post your tunes ... describe the vehicle these questions reference ... and perhaps we can provide you with some reasonable options.

    Just a little tip regarding Forum decorum ... if getting the necessary information from a posting person becomes like pulling teeth, then odds are that person will not get much support.
    i have the tunes on my brother's computer, and have yet to get him to post them up. sorry about my limited knowlege on this stuff. taz, if you think you can help me, call me at 248 459 9263, i would like to talk to you on the phone. i would compensate you with $$ for your help. i can email you the tunes
    2001 2500hd dmax/allison plow truck, stock.
    2002 2500hd dmax/allison, billet wheel s366, sc4 trans. 12.59 1/4 mile. 626rwhp/1015rwtq
    2007 TBSS-AES 390/4l80e, FI billet wheel s480, 801rwhp/684rwtq on 17psi with e85

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    No worries ... post the tunes when you can ... you could however, describe the vehicle and list any modifications.

    I would rather you kept going (appropriately) with this thread ... if you have these questions, so will others at some point.

    I barely have time to post these days, phone calls are not an option.

    Advice will always be free of charge - that is why Forums like this exist. For specialized tuning services (that no one else / or very few people could offer) I had to draw a line in the sand awhile back, and start charging a nominal fee.
    Last edited by Taz; April 7th, 2014 at 05:16 AM. Reason: - typo

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    2007 trailblazer ss 390ci stroker, 4l80e, 80mm turbo, runs on e85. SD tuned, 127lb injectors. e67 ecm/t42 tcm. was running trans harness with relays and only oss sensor, and ran it with 4l70e tune (some codes removed). the trans really never ran right with the relay type harness. the speedo would drop out, it would not shift out of 1st gear after a burnout, and would have no converter lockup on the hwy after driveing it more than 2 min. the the trans os # is 24238660.
    Last edited by dmaxvaz1978; April 7th, 2014 at 06:03 AM.
    2001 2500hd dmax/allison plow truck, stock.
    2002 2500hd dmax/allison, billet wheel s366, sc4 trans. 12.59 1/4 mile. 626rwhp/1015rwtq
    2007 TBSS-AES 390/4l80e, FI billet wheel s480, 801rwhp/684rwtq on 17psi with e85

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    Here is the modified 4l70e tune with 80e ratios and no ISS input, using the frost/pcm4less harness. Thanks again
    Attached Files Attached Files
    2001 2500hd dmax/allison plow truck, stock.
    2002 2500hd dmax/allison, billet wheel s366, sc4 trans. 12.59 1/4 mile. 626rwhp/1015rwtq
    2007 TBSS-AES 390/4l80e, FI billet wheel s480, 801rwhp/684rwtq on 17psi with e85

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