Im not an engineering major, but the 29 spline 8.25 will handle the 35's in my opinion especially with a light foot. You can get aftermarket shafts for fairly cheap as well. And the Arb is a strong full case locker. Ericsxj ran (maybe still does) 35's on his 29 spline 8.25 for quite a while up and down the rubicon trail and had good luck with it.
So many people to thank here's a start to the list
Spidertrax, Yukon, rustys, warn, branik, PSC, advance adapters, Bad wheels, interco, essentially off-road. And many more
Most of all thanks too Ian Johnson and the xtreme off-road crew for all their work, and 4 wheel to heal for their part in it too.