The ORANGE wire tells the GPR that the GLOW PLUGS are actually getting voltage and to start it's program.
The BLUE wire sends 12v. to the WTS lamp when the glows are glowing.
You can add a ring terminal to those and put it on the GPR stud.
Read this. Clinebarger is a 4l80 expert. Might be your problem?
https://ls1tech.com/forums/automatic-transmission/1883193-4l80-overdrive-problem-4th-gear-kicks-then-drops-out.html
The ORANGE wire runs to the fuse box GLOW fuse.
The 4 GP wires on the drivers side splice into that wire.
Cut off the 4 glow plug wires at the splice.
Use the ORANGE wire for the WTS signal.