30K oil doesnt do anything in the diff, feels like a tight ball diff but it doesnt go gritty after 7 minutes.
I will try the 30K tough, as the English drifters say its good on carpet to use tight ball diff.
Gear diff @ 30K CST is good to i think.
If i need more lock i will fill up my other diff.(spare)
Now where are the kits? i need my S400
its quite difficult to drive a chassis plate, C-hub, Rear Hub and a diff by themselves.