Buddys got a fj 80 front thats pretty beef and broke a birf with 39 krawlers on a super light sami. Go 30 spline right off the bat. 
it will have long before it gets put under my truck.
i would just stick with what you have til you have all the parts to swap in the fj80 axle otherwise who knows how long it would be down
thats the plan
