I'm finishing up a 6.0L/4L80E swap into my '88 RCSB and have a few wires I'm not 100 % sure on what they are. I need a schematic that shows all the wires that come through the firewall.

Also, is there a factory drive shaft that is the right length or will I have to have one made? The one that was originally in my truck is a few inches too short. The truck is 2wd and had a Th400.