51 custom diff cover gasket, need help!!

[Grapevine1]

Hey guys, my rear diff is leaking around the gasket and I’m trying to take the cover off to repair it. I’ve pulled the driveshaft and took all the nuts off the flange bolts, but can’t get it to split, my question is, do I need to remove the yoke at the diff? I’ve noticed there’s a big nut holding it on, or is there anything else I need to do or be cautious about when I take it apart? I don’t have any knowledge about these diffs and I can’t find any information.

I basically need the steps needed to replace the rear diff gasket.

Any help would be greatly appreciated, thanks in advance!