You can replace the spider gears without messing with anything else, remove calipers, and that 10mm bolt that goes through the centerpin, slip the pin out, push axles in, remove the "horse shoe" retainers and pull the axles out 5", remove driveshaft off the hub push one axle back in an turn it slowly and mind the washers that come out with the spider gears they'll fall right out, it'll be a bit of a puzzle getting em back in but that's the easiest, cheapest way to do it