It took over 3 hrs to get the bolts out the first clutch I did.....Heat, turn BACK AND FORTH, heat, TURN BACK AND FORTH, repeat for 1hr each is what it took. Tried welding but jsut broke/got in the way. Vice grips, lots of oxyace, and two people.
When we pulled the pipe from a RUSTY 97, we broke all four. I wound up getting the torch and plamsa to simply burn new holes through the flange. Put 1/4 bolts in place of the studs, worked pretty good. Not easy, but the plasma made it MUCH EASIER. It can be done with a torch, but get some good leather (for you, protection) and try to work from the top.
I tried drilling at first, no way you had enough room.
2001 Ranger with some stuff (RIP, some pieces still floating around)
2004 Level II and an 05 Rubicon with some stuff.