Thanks again. Lots of information for a guy who doesn't know how all this works. It's nice to talk to someone who does.
I pulled my trans pan and gave it a couple days to drip dry, so to speak. So last night I took a picture of the wires and switches inside and compared with my service manual, so I confirmed that my transmission matches the diagram ( 1986 MODEL BY ) which I attached to my first post.
Today I looked at my electrical section of my service manual, and I found the diagram for both the 3rd and 4th gear pressure switches, but no information on the switches.
When you say "(6) is third gear for the ecu flag which was only used in 87 on the turbo 3.8l BRF", I'm not sure what you mean. My 86 clearly has the 3rd gear switch. Does my 86 use the 3rd gear switch differently than the 87?
The guy who told me the switches are different works for Performance Automatic Transmission Center. He said the reason they're different is because you don't want 3rd and 4th gear to lockup at the same time. He said it's better to have 3rd lockup around 40 mph and 4th lockup around 50 mph. I don't remember the exact word he used, but he said lockup at the same time will cause "chugging" or something similar to that.