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Thread: 08 sierra 1500 4l80e swap no 4th

  1. #1

    08 sierra 1500 4l80e swap no 4th

    08 gmc 1500 4l80e swap with enitire segment swap from 08 express van. I have reverse and 1-3 and 3rd lock up but no 4th\OD. I CAN'T command 4th when driving but when I key on engine off I can command 4th no problem. I have the harness repined and even put a new valve body in the trans to rule out the AFL valve issue. I'm at a loss

    6.0 Engine and trans 46 trans redo.hpt
    4th.hpl

  2. #2
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  3. #3
    For anyone who searches this, I figured it out. In speedo calibration I had to enable VSS and configure it like the 08 express van file. IMG_20210215_141538.jpg