I am thinking ,if it is out of the car,say in a vise, use a two jaw, apply poressure, smack it with hammer, see if you can turn two jaw a little more, repeat etc. Use a big hammer if need be a 28 oz ball peen or a 32 even. Up it to two pond sledge if ya have to, but smack it a couple times then turn on the two jaw, you should tell if it is moving because you'll be able to keep turning the bolt on the two jaw puller it 1/4 turn increments.. eventually it should just pop loose. Oh and smack the yoke not the two jaw..:)
