I'm not 100% sure regarding Kaisers but every other car that I have worked on with similar power steering has grease in the gear box, not oil. Over fifty plus years the grease breaks down and liquefies then leaks out of the box. Take the same grease and grease gun you would lube your tie rods with and pump it full. The old grease will ooze out the vent cap and you keep filling until you see fresh grease coming out. Then adjust the sector shaft play on the car and unless you have bad bearings, it will tighten up your steering play. I would try this before pulling the box off for a rebuild. If you feel the need to take the box out, the pitman arm will definitely need to be removed on both ends with a specific pitman arm puller. Looking at mine it appears the entire steering column would come out with the box, a big job with the potential of breaking fragile parts under the dash while doing it.