Well, the original center diff mount plate I got with this chassis was pretty thick, and stuck the RCM mount up high enough to cause the rear bone to interfere with Gregers' custom G4 brace. So, I robbed the center diff mount plate I'd originally made for my Predator truck (before I got one of Gregers' custom center diff mount plates, which I am now using on that truck), and I modified it to work for this truck, as its about 1/4 the thickness of the plate I got with the G4, and lowered the diff down where I needed it to be for the rear bone to clear the center hole on Gregers' custom brace.
Cut the plate down a little so it fit in between the two chassis braces
However, it turned out using the thinner plate was still not enough. The RCM mount was still sitting a little high. So, I cut about 4mm or so off the bottom of the RCM mount legs to bring the diff down even farther (and I slipped some stainless steel 16mm shims in to take the slop out of the diff)
And since I cut some material off the RCM mount legs, I had to add a slot for the spur to stick through the bottom
Drilled some mounting holes in the chassis for the new plate
And mounted it all up
With the center diff mount much lower, the bone now clears the top of the custom G4 brace
-Travis