i need a indestructable rear diff, please help

[blueb8llz]

sorry neil . the diff section is totally all new to me. so your telling me i need the flm bulks to fit the UE diffs? whats the bare mininum i can get away with on making a better stronger diff? i sorta wanted one with no mods, just a direct fit. is there a place to just buy each thing seperatly since i dont need the whole set up. most places sell them with the front and rear diff.
sorry for the newb questions. like i said, the diff is all totally new to me.