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  1. Z

    4l80e swapped, no 4th gear

    No the output is still on the tcase the input is the only thing I had to add in
  2. Z

    4l80e swapped, no 4th gear

    It is in the right pinouts, I did try switching the pins around to see if it was backwards but that didn't fix anything
  3. Z

    4l80e swapped, no 4th gear

    Yes, I know the previous owner of the truck it was good. After swapping the chip into my old computer and putting it in the only code is 68- engine speed and trans input speed not matching
  4. Z

    4l80e swapped, no 4th gear

    Its been checked re checked and checked again by someone else
  5. Z

    4l80e swapped, no 4th gear

    I got a pcm for the 4l80e
  6. Z

    4l80e swapped, no 4th gear

    Blew the 4l60e in my 95 so I've put a 4l80e from a 97 in. I have repinned everything correctly and wired in the iss but thats where things get wierd, with it hooked up I get codes 68 and 85 when I unplug it those go away but code 74 shows up naturally. Also for some reason with the tcc solenoid...
  7. Z

    4l80e swap

    Both plugs were green the only pin I had to change was for the tcc solenoid but after I did that when I drove it the trans almost cooked
  8. Z

    4l80e swap

    Everything works except I have no overdrive I've poured through forums trying to figure out why. It did come with a 3000-3400 stall converter but I don't see that preventing me from having overdrive
  9. Z

    4l80e swap

    I have a new computer for this engine/trans combo both harness had green plug so i didn't think I'd need to re pin anything
  10. Z

    4l80e swap

    So I just did a 4l80e swap in my 95 gmc (was a 4l60e that took a ****) everything is hooked up right but my rpms are way out, 2700/100kph the trans is out of a 97 so the input speed sensor behind the housing on the driver side isn't hooked up. I'm wondering if that sensor is causing the high...

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