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4l80E question?

Discussion in 'The Garage' started by LoggieStyle, Feb 10, 2003.

  1. LoggieStyle

    LoggieStyle Registered Member

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    This may be a dumb question but all the wiring info I have found online has been vague at best.
    In a 99 Suburban is the 4l80E transmission controlled by the same computer as the engine or does it have it's own unit?

    Thanks,

    Logan
     
  2. HarryH3

    HarryH3 1 ton status Author

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    If it's a gas engine, then the engine computer also controls the tranny. Diesels have a standalone computer just for the tranny.
     
  3. LoggieStyle

    LoggieStyle Registered Member

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    The reason I ask is because I am putting a vortec engine in my blazer and I was wondering if I need to buy an aftermarket tranny computer to hook up a 4l80e behind it. I guess I don't need to then?

    Logan
     
  4. HarryH3

    HarryH3 1 ton status Author

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    If you get the engine, tranny, complete wiring harness, and computer, then you'll be off to a great start. /forums/images/graemlins/thumb.gif You'll need to do a lot of reading to find out where the tranny gets it speed info from, etc., etc., etc.
     
  5. u2slow

    u2slow 1/2 ton status

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    Fly-by-wire turbo diesels (94-up) use a complete ECM that controls the engine and the 4L80E. The standalone computer was used on 91-93 diesels and up to 95 on the vans (non-turbo.
     

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