Yeah they run it off the abs module, you get around it by running a extra speed sensor off the tailshaft/gearbox? I cannit remember which one it is br it's doable
My plans for the diff is I am in the middle of rebuilding a r200 LSD I got from a member on here and I'll be running the billet driveshafts from MADDAT, I cannot seem to find any z31 turbo shafts so if anyone reads this and had some inbox me please I am very interested in them
I was planning on caging it but I have seam welded the whole front end, inside the engine bay, strut towers, casssis rails, ( I didn't personally I prepared it and my boilermaker mate did the welding ) and have to seam weld all the panels inside the car/strut towers and add some chassis bracing aswell as per the Engineer
All in all it's been good because I have been able to prepare all the panels and see what under the paint which so far isn't bad at alll so I'm happy about that
After we fit the engine and are happy with how it looks the engine will come back out, paint the engine bay and get the whole car painted then re install and hit the highways and drag strips/tracks ahha