Just wanted to say thanks for the fantastic info provided in this post. Swapped my 4eat for an 03 Rex 5 speed in a weekend. Everything works perfect.
Pull out slush box
Install 5 speed and matching diff
Install pedals and clutch master
Pin 81 to ground (this drove me nuts coming from a Honda background as Subi goes off the plug, not the ecu)
Unplug center tcu plug
Wire backup light
Wire neutral switch to clutch pedal upper switch.
New fluids and drive