Manual upshift downshift 1,2,3,4 on 4L60e without manual valve body

[Test101]

Hi,
I am trying to help a friend out with an issue, his offroad only 4x4 vehicle is running an LS1 with the 4L60e and LS1 PCM.

Ideally the auto would be set up to shift the same as a manual valve body would and I believe this can be done with the PCM by changing the speeds on the upshifts and downshifts so that they are void, making the shift totally dependent on the shifter position.

I have read one thread that elludes to this method and that it should work but has anyone done it in practice using efilive and what parameters needed changing in specific. apologies if this has been covered elsewhere, but I did a few searches on the 4l60e and found nothing conclusive.

Also I assume that if the auto shifts are made void then the default operation (by PCM) is to mimic shifter gear position as the gear to be selected, as a PCM decision is still needed to get and hold the gear in that position.

Thanks for your time.