Not sure about hanger pins but on my old Jeeps a MAPP torch, a BFH and lots ofr PB blaster was my friend. When you put it back together lots of lube for the bushings and should be good. Im not far but have a packed weekend. So all i can give is my voice and a cheer or two when it comes loose. Sorry. Springs are the easiest to work on though. Just a pain when they have been on there for a LONG time. Good luck.
08 TT FJC
82 Scrambler (Scraps)
81 Scrambler (Sassy)
07.5 Dodge Ram 2500
69 Maro... next project when the Jeeps get done.....