Originally Posted by disciplerocks
Put your breaker bar on the bolt and rest it on the suspension. Then unplug the coil pack and crank it over. That will knock it loose.
Posted via FF Mobile
That's how I do it. If that didn't work, and the car was a manual transmission, I'd chock the wheels and put it into gear to keep the motor from moving. That might give enough resistance to help the impact do it's magic.
If not, then remove the starter and see if there's some way you can secure the flywheel. That is much easier to do on AT's where you have holes in the flex plate to grab.
Ford makes a special tool for this IIRC, but I think you have to remove the transmission to get it to work. If I was faced with that predicament, I'm not sure which one would cause more trouble- drilling out the bolt to remove it, or removing the transmission to secure the crank.