I never tried it TBH..
I took the geared diff out of my sc and replaced with a ball diff... simply because the outdrives of the kit geared diff had ridges worn into them from the cvd's and there was now alot of slop..
But with running the ball diff in the SC for a good while now i dont think i will be going back to a geared one again... seems so much smoother to drive with the ball diff. So with these findings i wont be trying a geared in the lighter smaller RB5.