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Thread: Switching from $OD to $OE

  1. #1
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    Switching from $OD to $OE

    Besides tuning and uploading the mask and bin to the OSTRICH 2.O do I need to rewire anything else on the 7427 transmission? I'm curious cause it would be cheaper to build a strong 4L80E than a 4L60E.
    I'm guessing I would need an adapter harness to connect to the 4L80E since the connections are different.

  2. #2
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    Just take a look at the wiring diagrams and swap the appropriate pins (unless you have the old 4L80 connector with a bolt through it, then you'd probably want to swap the harness/connector in the transmission as well). You'll also have to add the input speed sensor (ISS) wiring.
    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
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    Okay that's what I was guessing, I know for the Gen III all you do is add an extended harness with a swap pigtail and just do some tune modification.

  4. #4
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    Quote Originally Posted by trippyjoey View Post
    Okay that's what I was guessing, I know for the Gen III all you do is add an extended harness with a swap pigtail and just do some tune modification.
    My 60E harness was too short! Had to make myself a pig tail from a junkyard 3/4 ton Suburban and extend my harness. Also had to add the input speed sensor wires.

    4L80E was well worth the swap. Now I just need something deeper than 3.73 out back.

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