I have completed a swap from the 6 speed to 4L60E in a 2002 Z06. I used a pin out conversion harness from RPM transmissions to use the factory computer. With only ever making minor changes using VCM editor, I paid a large reputable shop to create a tune file for me.

I am having issues with the transmission staying in limp mode and I only can use 1st and 3rd gear and it will not shift on its own.

When I use VCM scanner I am receiving no information from the transmission at all. Such as the gear indicator.

I am having doubts on the tune file. When opening the tune I am seeing that in the transmission section it is set to manual and the PRNDL is set to none. Does this seem correct for this application?

When comparing my tune files the 6 speed file and 4l60e file they appear identical.

Thanks for any input.