I just finished doing the same job. If you have not inspected the bearings before, you should do that while you have them out. All you need to do is clean them up enough to see if there is any pitting. If there is, replace that bearing. I was able to save 3 of the 4 front bearings (only had to replace the left outer bearing) on my truck. Mine had obviously not been maintained very well by the PO as none of the grease fittings anywhere had been used let alone repacking bearings. Yes, you will get greasy
but that is half the fun of working on these old beasts. If you don't have a service manual, when you replace the hubs the spindle nut should be torqued to 33 ft lbs and then backed off to line up the hole for the cotter pin. That will result in the correct pressure on the front bearings. Good luck and have fun.
