[Sneeck]

For such a setup you dont really need those diff's, as long as your easy on the throttle. But when you want to do wheely's and wheel spin's and the like's you'll find the weakspot's fast enough.

You could also look for alum diff cup's and alum diff housing's. Those help a bit. But if I where you i'd do it right the first time - get the 8 spyder. Saves you from buying cheaper stuff later on, since cheap stuff usualy don't last's.

I bend 2 ue cvd's with the rpm arm's, and it wasn't from jumping. Just tight cornering. So there you got my answer. Don't think the stock arm's flex as much.