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Thread: TH400 to 4L80E swap and 1227747 to 16197427 swap

  1. #1
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    TH400 to 4L80E swap and 1227747 to 16197427 swap

    I'm going to convert my 87 Chevy 4x4 - 350tbi/t400/np208 over to a 4l80e/np208

    I'm swapping in a 16197427 controller and I believe there was a cal for that ecu and the 4l80e

    My first question would be what year 4l80e transmissions should I be looking at?

    Second question is if I get a 4x4 4l80e do I need to install a speed sensor in the transmission for the ecu and use the current sensor in the t case for the speedo? Or is there better options?

    Thanks for any help you guys can offer

  2. #2
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    When using the 7427, you'll need a '94 or later 4L80. The '91-93 have a force motor that isn't compatible and would need the '7060 ECM instead. The 4L80 uses two speed sensors (Input Speed & Output Speed). The forward sensor on the transmission is the input speed and the aft one is output. I'm not an expert on them, but I believe you could use either the one on the transmission (assuming it has one, could be blanked off on a 4x4) or the one on the T-case for output speed.

    The speedo output will come off of the VSSB (Vehicle Speed Sensor Buffer). Your '87 probably has a DRAC(instead of VSSB) built into the gauge cluster, I don't recall if that year has a cable drive speedo, but if it does, you'll want to swap it with an electronic speedo. If it's already electronic, there might be a way to use it with the signal from the VSSB, but I'm not sure.
    1973 K-5 Blazer, TBI 350, TH400, 1 ton axles & 38" SSRs'
    1975 280Z, TBI 350, 700R4
    1953 M-38A1, TBI Buick 231
    1951 Ford Panel, 5.3 with 4L80E

  3. #3
    billygraves
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    4L80-E swap

    ...............
    Last edited by billygraves; 06-30-2019 at 06:09 PM.

  4. #4
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    Thanks for the info.

    Does a 98 4l80e have the same wiring connector as say a 95??

  5. #5
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    Yep, same connector for a '98.
    1973 K-5 Blazer, TBI 350, TH400, 1 ton axles & 38" SSRs'
    1975 280Z, TBI 350, 700R4
    1953 M-38A1, TBI Buick 231
    1951 Ford Panel, 5.3 with 4L80E

  6. #6
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    K I'll look for a 98-99 core. Should be a good place to start.

  7. #7
    billygraves
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    98 99 core

    .................
    Last edited by billygraves; 06-30-2019 at 06:09 PM.

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    Watch the aftermarket fittings... they're junk. Local GM dealer is selling someone else's fittings in little baggies with GM number on them. :(

    There's a tool to make the trans quick connect fittings using a hydraulic flaring tool. This means you might be able to find a guy that can form ends for you. My local trans guy found 3/8" inverted flare adapter fittings in someone else's application, iow not GM. Possibly AM General for "real" Humvee?? I may have part numbers around. We were using them in buses until tool became available for quick connect ends. BTW, billygraves, do you know a "real" name for those fittings? We also know to use steel lines here. When high temp paint burns off of cooler lines you know things are hot.

    Old school bus is a great source for 4L80E trans.

  9. #9
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    I have access to a hydraulic flaring tool for 1/4 thru 1/2 stainless line. We use Parker fittings on the Trans side. I'll probably going the custom steel line all the way to the cooler. Not sure what cooler I'll put on it yet.

  10. #10
    billygraves
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    ..............
    Last edited by billygraves; 06-30-2019 at 06:09 PM.

  11. #11
    Fuel Injected! EDZIP's Avatar
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    FYI only..had this site bookmarked:

    How to Control a 4l80E with a GM 16197427 ECM

    http://mattw.dyndns.org/4L80E/

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    Friend of mine has a 06 he said he'll give me. Is this something I can use or is there a cut off on the years I can control with the 7427 ecu

  13. #13
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    I picked up a 2004 4l80e with convertor last night.

    Would I be better running a 16196395 ecu since that's what came in the 94-95 350tbi trucks with a 4l80e or will the 16197427 work just fine. I have a 7427 ecu I just need the Eprom for it. Already have the moates adapter and a apu1

  14. #14
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    No difference in those PCMs, either one will run $OD $OE $E6 or $31.
    89 K1500 Scottsdale 5.7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap
    95 C2500 Cheyenne 6.5L turbo diesel 4L80e 4:10 DB2-4911 Manual pump conversion 0411 PCM trans control 2Bar COS
    05 Outback XT 2.5L turbo gas auto

  15. #15
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    Cool. Does it matter what eprom I buy to work with the adapter? Like does it have to be of the same base bin I plan on using??

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