4L60E Trans only shifts 2 and 3

[dayj1]

Originally Posted by ewoody625

I have 10.6v at the pink wire on the big round trans plug. That is what I am currently tracing back to see where my voltage drop is coming from. I do not have the tcc wire hooked up, I was told that is optional. To clarify, the tcc gets power from the brake switch? Or it goes to the brake switch and to a power source? I'm at the end of my rope on this. Ready to pull it all out and put my 350 back in. I appreciate the information.

Just in case you weren't aware, there are 2 pink wires in the trans connector, pins "E" and "N". "E" is the 12v ignition power and "N" if from the transmission fluid pressure switch and runs back to one of the PCM connectors. Be sure you're checking pin "E".