[JimKshortstep4x4]

I believe 2 wd trucks up to 82 will interchange without having to change the hose adapters.

Before you condemn the box I would make sure the box is flushed out. Unless the box was outside for a very long time there will not be much water in it.

What has worked for me is to purge the box with fluid using an electric pump.
Once clean fluid goes through most of the water and contaminants will be flushed out. Once the box is installed bleeding the air out will take some time turning the wheel lock to lock. You may have to let the box sit until the foaming dies out before adding fluid to the reservoir. Once the air is bled out and the reservoir is full your power steering should work.

Jim