Hi, I Have a 1993 A31 Cefiro SE4, i have done the Conversion, Your Gts4 and my SE4 are the same, So i can give you some pointers, The R33 GTR gearbox has better gearing, your original sandw plate will be fine, The only difference is the standerd plate does not have the half shaft cut out,The gtr half shaft is a bit bigger than yours. your auto drive shaft should or will bolt straight back on, mine did, The Oil feed lines will bolt straight back on to the gtr box, Change all the oil for the whole 4 wheel drive system so let the rear feed line drain, it will empty the pump on top of ya rear diff and ya oil container, mine is in the boot on the right side,Also the front diff and clutch plate OIl. Leave the speed sensor disconnected, you can connect the reversing light switch i think its the same, I think there was a bit of modification on the rear gearbox mount, Sorry i cant remember that one, Use a 10in Clutch and pressure plate, I USE THE PULL STYLE CLUTCH, Stranded gtr , Its has been good, It has let me down twice on super fast take offs ive spun it but its all in the way you let it go with the throttle, i dun the spins in the first 6mths after the conversion , have dun that for 4 years or so, I also change all my gearing to 4.1 as i want more mid n top end for the open road,250ks check my listing to see the other mods i have done, Oh yeh when you re oil the pump and lines to.to the rear of the g/box is were you bleed it from, Mine took ages to get pressure again but it kinda the norm, Mine has been working perfectly since, but that oil is 20 odd years old, e this burble will help you, Jamind