OldIron described the bearing cleaning and inspection pretty well. The only point I would add is to pack the bearings thoroughly when you re-install them- don't just smear grease on the outside of the bearing. With roller bearings, that process is messy and takes some effort: take a handful of grease in the palm of one hand, then push the big end of the bearing into the grease until it squishes out the other end of the beaing. Then smear a layer of grease on the outside of the bearing. Its easier with ball bearings- you just fill the cage from the inside until grease squishes to the outside of the bearing. Then smear a layer of grease on the outside as well. In either case, too much is better than too little, but you don't need to fill the hub with grease. Alternately, you can buy a bearing packer and use a grease gun to grease the bearings- but there is less intimacy that way. Either way, use wheel bearing grease, not chassis grease.
I would plan to replace the king pins and bushings, since you are cleaning up the axle. Are you planning to remove the axle from the truck, or clean it where it is? Are you planning to refinish the axle? If not, I would leave it as it is.
You need a tie-rod fork (pickle fork) to remove the tie rod end from the spindle, but in doing so, you will damage the grease cover on the tie rod end. Those can usually be replaced separately. If there is any doubt about the integrity of the tie rod ends, I would replace them. Its cheap insurance. Then you have to adjust the toe-in, so if you remove the tie rod ends, count the turns needed to remove them, then install the new ones with the same number of turns. You should still reset the toe. More on that process if you need it.
Harvester
