I attempted the same on a donor axle from a 1 ton
I had it in the press at 20 tons and it didn’t move
I gave up on it and moved onto other projects
I kept the original sloppy king pin axle in the truck for now
Hoping to find a solution one day
The plan was to rebuild the donor and swap it into the work truck

Thinking maybe pushing out the pin with an oxygen lance in the future. But that might be too hot for the axle

Please post any solutions as I’m interested too
-s