Dana 44 Kingpin Servicing

[Onry69CST]

I'm going through my Dana 44 closed knuckle on my 69 k20 and have everything off except the kingpins. I'm apprehensive to take it apart because everything seems well greased, tight, and in nice shape. I don't want to create any extra issues or fix something that's not broke. Although I believe the knuckle is supposed to be filled with heavy oil instead of grease, correct?

So two questions, how do you know when your kingpins need attention, and what's the risk of disassembling just to inspect, then creating issues upon reassembly? Thanks guys