I've just replaced my kingpins on my 52' 3600, and the bushings were a tight fit into the spindles (i used a press). BUT i did have to take them to a friend of mine at his machine shop to have them in-line reamed. The king pins are a little snug now but still move freely and will settle in just nice. He charged me $40 but it was well worth doing.
Regards
Tim
p.s PLENTY OF GREASE !!!!!!!!!!!!!
