Strange engineering has a you tube video showing that their version of the Dana 60 with its threaded differential adjuster allows gear changes is 20 minutes if you already have your shim pack thicknesses figured in adavance. The Dana while slightly heavier, being of a Salisbury design is inherently stronger than a banjo design axle. The 9 inch can be beefed up to the strength of a Dana but look at the cost difference. The weight difference of the Dana is in the right locations and is precisely what makes it stronger imho.