Interesting! I did not know that about spec-r diffs. I had to be inventive to fit. Issues include: rear belt tension, rear dog bone lenth and front shock tower to front diff clearance. A dremel to the front shock tower and dykes to the rear control arms to widen the rear. Much better handling with the wider stance and far easier to control. This I hope makes for a great VTA setup.
It's not what you race, but rather how good you race it. RC racer for life.
VTA mafia member
Drive it fast, climb it slow and what ever you do, do it pzazz!!!