If an ifs box sector shaft works ( ifs rigs are basically 2wd trucks as far as front steering goes ) I have a box I can pirate the shaft from .
Is your steering column a splined shaft or the D shaped shaft?
Changing a gear box on the trail is a big enuf pain I wouldnt want to try and change the sector shaft.Probably be easier/better off carrying a spare box.
Too heavy/bulky.
...I've never saw a steering arm that would come off w/o a puller and an impact.
This is becoming very complicated. I presume you mean pitman arm rather than steering arm? There's a puller in my toolbox, the x-over install happened about 1 1/2 years ago, and the truck lives in AZ = no rust.