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Working on tearing down my 60 to get ready to rebuild. Do these kingpins look like they need replacement? They feel smooth to the touch and I didn't see any uneven wear on the bushings. The vertical mark on the second picture is from a screwdriver when removing the seal.
For the $40 a new set will cost you, I think I'd go for it while it is apart. I rebuilt my D60 last fall and after needing to replace almost every other part on the dang thing, I just decided to go for it for the peace of mind.
If you are planning to blast or strip the axle go ahead and replace them. If you're just going to wire wheel it or do nothing to the axle, leave them. They don't look bad by any stretch of the imagination.