I remember doing these about three years ago, not that bad but just has time was your enemy seizing these little buggers, time is your friend too. First don't get in a hurry, remove the lubrication fittings top and bottom as well as the top and bottom stake plugs, then the lock pin.
Next, I took a propane torch and just warmed the joint a couple hundred degrees only, you can use one of those cheap temp gauges you get from harbor freight. Next squirt some Kroil penetrating oil into the lubrication fitting holes and lock pin void as well as the top and bottom of the king pin, give it a couple taps with a small ballpeen hammer/exercise the joint and say your most favorite chant or rain dance if you like. Then repeat the same the next day. On the third day, heat the upper and lower spindle housing joint and the ibeam to a couple hundred degrees, then with a suitable drift and hammer drive the king pin out. If all the planets are aligned and you did the rain dance right, you should hear a clap of thunder at that moment and the king pin will begin to move. Then repeat for the other side.

Last edited by sstock; 03/04/2019 2:55 PM.
1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
In the DITY Gallery
Video of the 261 running

1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration