Hey 872Door, I have a factory shop manual for my 89, should be unchanged from your 87... it has all the wiring diagrams in it so I can look them up for you for your tranny and photocopy and mail them to you (I dont have a scanner) and maybe someone else on here will have a newer manual and they can do the same for the 4 spd tranny and TCU you want to install, then you will have all the diagrams at your fingertips. I cannot offer any advice to you on the swap, but from what I know everyone else is correct in saying you will need the newer tranny TCU, and there may be wiring issues. Let me know if I can help...