I'm building some custom 9.5 axles and I bought some arbs already in fj40 diffs. I have 2 fj80 master gear installs and 2 fj80 9.5 diffs. The fj40 diffs with the arbs need rebuilds which leads to my dilemma. Should I build the fj80 diffs or build the fj40 diffs? Front is a 9.5/fj80 hybrid and the rear is a centered FF with fj80 parts. My question is, are the fj80 diffs stronger than the fj40s? Is there an advantage to one over the other?? Any help is appreciated.