I never saw a king pin bushing glued, when I run across one I cant get out. I mount the spindle level in my vise, take the open handled hack saw blade, make a slow deliberate level cut, stopping to check more than needed so you don't gouge the bore. I take a small screwdriver that I an willing to sacrifice and drive it under an edge. if it doesn't give I make another cut in the bushing 180 from the other.
being glued you got lots of choices on what might help. I always try jB blaster soak and let sit overnight. Acetone the paint hardware store has it, might dissolve it. Next the propane torch, just make sure you washed off the liquids. Some of them when heated give off vapors that can cause you severe medical problems.
Remember Some king pin bushings like on my 1/2 ton are floaters they can be installed by putting the pin in the bushing and lightly tapping them in. Others like my one ton have to be pressed in and a special reamer used to resize them. Hope this helps.
If the spindle is nice and clean you could bake the spindle in the oven. 300 degree will most likely cook the glue to the point where it breaks down. Hope this helps good luck.
