rear main nuts problem

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I have been trying to drop our rear main bearing cap for some time. I am doing this with the engine in the vehicle and its kind of difficult.

It is difficult to get a socket in between the cap and the bell housing. I have a swivel socket which is not quite deep enough but a normal socket with a wobble extension works decent.

Problem is they won't budge. Is there something I am missing? I removed the cotter pins of course.

Will an impact gun work on this or am I going to just break the socket and or extension? The wobble extension doesn't seem like the strongest connection in the world.

Also if there is anyone in the Metuchen NJ area that could help it would be greatly appreciated. I am dropping the cap because we have a pretty bad rear main leak.

Chris J