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Thread: 4L80 swap

  1. #1
    Fuel Injected! 1leg's Avatar
    Join Date
    Jan 2012

    4L80 swap

    Thinking about moving up to a 4L80 2wd transmission in my 1993 1/2ton 4wd. I know why not just get a 2wd truck. long story better left for a build tread on another forum.

    My question is will my 8625 $E6 do the job? Will i need a 1993 4L80 or can i use any pre-LS version? Can you think of any other wiring or programming issues i need to know.

    Sorry, If this tread is in the wrong forum, feel free to move.

    1993 RCSB 1/2, 350/4l60 Eaton locker 3.42-1. Drag truck ET 10.84 1/8mile. Build Thread
    1989 V2500 Suburban 350/th400, 4.11 gears, Tow truck, needs TBI 454 swap. Build Thread

  2. #2
    Vintage Methane Ejector
    Join Date
    Apr 2011
    The 8625 should be fine; the 16168625, 16196395 and 16197427 are pretty much the same; though I have heard of some not having all of the internal parts for a 4L80-E.

    $E6 and $0D won't do it without modification. I know one guy over at FSC was using $0D for a 4L80-E. The mod didn't sound very difficult to do.
    $0E and $31 will run the 4L80-E and will work in the 8625, without modification. All of your existing calibration can be transfered over, except for the trans part of course.

  3. #3
    Fuel Injected! droptopstng's Avatar
    Join Date
    Feb 2012
    Oxford , AL
    I believe all the 4l80s are close enough to work except for the later model that had a single connector prndl switch as i know it had a different epc solenoid but I will verify this monday morning
    Wise man once said,better to stay silent and let others assume your and idiot than to open your mouth and prove it........and yes im an idiot lol


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