I use a 20 ton bottle jack and a fixture I made to support the top of the spindle. Push the kingpin out the top. Been doing it for quite some time that way. Send me a PM and I'll send you a sketch. Yes, the new bushings need to be honed or reamed to fit the kingpins.
Jerry
Hey Jerry. Alot of the things I see you say "PM me" for can usually help other folks. I'm not big on pm'ing. No particular reason. I don't like to talk on the phone either lol Your sketch sounds interesting though. Could you just post it up?