Anyone have a diagram/picture of what each of the plugs that are external on the 4l80e transmission? I color coded the plugs red and the wiring harness pins blue to make it easier to reference. This transmission is mated up to a LQ9 motor/wiring harness. I know the big round is is the main plug and I believe one of them is a speed sensor (#4 wire and #5 plug), can anyone tell me what the other plugs are used?

 

Pic quality is a little off, but from what I can see, your #6 wire goes into youre #3 plug. #2 and #3 are your PRNDL and neutral safety. 1 is a speed sensor. Looks like you are missing 2 connectors.

 

#1 is input speed sensor(not used on some aftermarket controllers), #5 is output speed sensor, #4 is the main case plug, contains all the wiring, the rest are as said, just an external information switch.

 

Okay thank you. I am swapping this in my old nova. Do I need any others besides the main plug and either input or output speed sensor? Guessing I need the output? Can I just cap the other plugs and not use them??

 

They make a dummy plug you can use on the input, or just leave the orig plug there. You can remove the switch from the shifter.
What are you going to use to control the trans

 

I wanted the factory computer to control it.

 

Zane, I have tried to plug #6 into #3 but it's not the same plug type. Keep in mind the lq9 motor has a 4l60e and not a 80 from the factory. That might be why I'm missing some plugs