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Thread: ls3 4l80e swap , about to begin

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  1. #1
    Join Date
    Feb 2012
    Posts
    108
    the motor was 6k with shipment,
    im going to change rod bolts in it. it also comes with ls9 head gaskets ill probably put a tvs2300 in about a year.
    I have gmpp e67 with stand alone harness this will make the engine run, can i make this work with my stock ecm and tranny, and not have to buy a trasmission controller...

  2. #2
    Join Date
    Feb 2012
    Posts
    108
    i bought an engine stand last week and got the engine fully assembled , im working on a coil relocation bracket its just that this truck coil are to big.
    also foud out that i can run a trailblazer ss 2007 OS ,ecm / t42 to make my setup work now I need a way to get a t42 harness and tied into my gmpp harness.
    I will call nelson performance to see if they can do that for me.

  3. #3
    Join Date
    Feb 2012
    Posts
    108
    motor is ready, just waiting on resolving the harness problem to start taking out the 350, I also have this pulley kit for it, which i migth end up selling to start funding for a s/c kit to come.
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  4. #4
    Join Date
    Mar 2003
    Location
    San Antonio, TX
    Posts
    11,038
    The engine controller is separate from the tcm. Simply flash a tcm with a 80e flash and run the CAN lines and trans wires. The trailblazer OS has nothing to do with it working. That's the engine side.
    We've done a few a few LS3 engine harnesses with the 80e behind it. It'll work.
    I need to know the specifics on what u have but it sounds like it shouldn't be a problem.

    PM me or ray.

  5. #5
    Join Date
    Feb 2012
    Posts
    108
    so I've been making some progress , while working on my truck harness i cut by mistake the a/c high pressure cut out switch plug, ( the 1 that goes to the sensor on top of a/c line) its this necessary to have.
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  6. #6
    Join Date
    Feb 2012
    Posts
    108
    i got it figured out guys, what starter should i need with 4l80e trans, flexplate and spacer?

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