gotrocks has 5.29 gears with 37x14.50 tires and he managed to break a set of Profields (which damaged the splines on the inner axles) and a stock spare, all in two days in Moab. He upgraded to a set of 30-spline Longs and the pinion (Yukon Gears) broke a couple of days later.
His plan is to get the front ring & pinion cryo heat treaded by Bobby Long and then add some additional studs to the hubs (arp?).
I would spend the coin and just get some of Bobby Longs axles. The 27-spline might be ok, but saving a little money doesn't seem as smart when fixing broken parts on the trail.