For the diffs, 5-5-3 front to rear is common I believe. that is what I am running.
For bodies, if you want something that fits tighter, you can try the Hot bodies VE8 body, and mount up the Tekno mudguards for a nice fit from what I have read on RCtech.
+1 on the diff weight.
Cain, I have nothing on my schedual Weds(clean slate!) I will be getting your chasis done 4 U.
I retired from RC, now life is all about guns and long range shooting.