truggy question

I have my first truggy, a Losi 8T and I am in the process of installing thier BL conversion kit an. A question I have is what is the most direct route to removing the center diff. I have tried removing the set screw at the rear driveline going into the rear diff and that didnt budge...now I am thinking about removing the rear diff assembly so the rear driveline slids off of the rear of the center diff