You can probably do the universal shaft trick on those dogbones too, provided there's enough space. You just need the yokes and the sliding shafts. Probably just dremel down one yoke for the brake disc and you'll be right.

[link=http://www.rcuniverse.com/community/profile.cfm?section=profile&forum=1&memid=376812]eminentguitar[/link] successfully fit some HPI MT2 dogbones and drive cups on the rear of the transmission. He reckons they are a lot tougher than the redcat ones. Send him a PM and ask for details.