1955-2nd Shop Manual king-pin replacement instructions. As described by CASO, check "Disassembly": the king pin plug stakes have to be chiseled out/away - there is a top/bottom plug that had been
"staked" into place.
I have only once been able to knock out the king pins with the axle on the truck. All other times, I have had to remove the axle and use a hydraulic press (or, take the axle-assembly to a truck shop) to remove the king pins. After the king pins are removed, the floating 1/2 ton bushings should then come out fairly easily.
You could try a bigger breakfast and a bigger hammer - you have nothing to lose.
