Here's the upper kingpin on the axle housing. These thread into the inner knuckle half and are torqued to about 550 lb-ft using a 7/8-inch hex key. Fortunately, the ones on this axle were still well greased and were not scored or otherwise damaged. They can sometimes be a real chore to remove. Worn kingpins can lead to steering slop and shimmy, or death wobble. At this point, the disassembly was complete and the axle was thoroughly cleaned and readied for reassembly.