I think that will work out well for you. I'm considering doing the same in my daily driver. I don't put it in situations where I really need duals but a little lower gearing would be nice. If it was my only wheeler then I would go duals with a regeared back case but since it's not running 4.7's is sounding really nice.
1985 toy, Hybrid 20r/22r on propane, 30splines, custom built leaf packs, welded front and rear diffs, dual ultimate crawler, full hydro, full exo, flat bed, 37' mtrs