I just dealt with this myself. I had to take the bolt out twice, as I didn't have oil pressure the first time I tried.

Both times mine came off with elbow grease. The first time, I used a 3/8 drive - no problem. The 2nd time, that same rachet broke internally on me while trying the same maneuver. I went and bought a 1/2" breaker bar and used a 1/2" to 3/8" adapter with a 3/8" drive 19mm socket... I then sheared the adapter... Ran to the parts store and found a 1/2" drive 19mm socket... Used more elbow grease and thank the good Lord it finally gave it up.... I was way worried for a moment though.