Will I be able to fit these center shafts
on the HB diffs? http://www.rc-monster.com/proddetail..._G-MAXX&cat=11
I think the HB are 8mm, Can i change the pinion gear to get the Drive cups to fit? Any suggestions please.
No way. I don't see how a RR pinion will work in any way. Simply get the HB cups for the 8mm pinion. Mike should have them, and might even be able to include them for you instead of the 6mm ones.