lol. noob.
its a 7/8ths allen. big sucker right on top, you probably have grease in the top of the kingpin. they sell the allen key, but its expensive.
i buy all my d60 rebiuld stuff from greg at 4wdfactory.com. if you wanted you can take the housing to a truck center and they can swap the kingpins out really easy and probably cheap.
after a couple sets, they start to get more and more worth it to take it to somebody! i dont have the 600 ft/lb torque wrench like somme people.
the dana 60 is so easy. after you tear into it, you wonder why it was so intimidating.
oh, post a pic of the kingpin itself, you may get lucky and them actually be still good.