Steering Box Removal

It is imperative to have a pitman arm puller to remove the arm. If there is a lot of rust, soak it good with penetrant. Since I'm in Ca. I don't have
to deal with the rust issues in salt country. I have never had a problem removing a pitman arm, and have never had to use heat to remove one.
I did grow up in Indiana so I remember pick up bed sides flapping in the wind.
Being a lifelong rust country guy, I always hit any bolt/nut I can get to with a wire wheel in a cordless drill before I soak it down. A bit of heat from a propane torch (watch for brake or gas lines, and don't get it hot enough to mess up any close rubber parts!), in between soakings of loose-juice, helps out a lot.