The pins should unscrew( is that a word). The bushings should come out with a puller/press. make one out of some threaded rod and an old socket,a piece of pipe and some washers and nuts.
You can clean the frame where the bushings go with carb/brake cleaner, it probably won't be that dirty/rusty. A little oil on the bushings before you press them in won't hurt anything and don't reuse the zerks, the new bushings should have new ones. When finished grease the bushings with the wheels off of the ground.


Tommy
59 apache 1/2t
261 short stepside