LS/4L60E help

[Iceburgh]

I need some help getting this going and I am at a loss.

I have a new motor after issues with the 1st one.The new one is a 6.0 iron block that runs great at least in 1st gear and idle

I have had the PCM that came with the unit I bought and I have also recently had another PCM tuned by Garrett tuning in Ohio that was to help with shift points.

I also took out the original harness and put in a new PSI harness.

Still the same issues. Will shift in manual at least 1-3 but not in auto.

What am I missing. The speedo is a GPS unit from what I understand that should not matter.

https://youtu.be/jkvhadSxe2E


Is it a tune is it a sensor?????