How hard is this to change without dropping the pumpkin?
Like he said above, search is your friend.
If you remove the driveshaft, front and rear differential mounts as well as the front torque brace you can slide the differential forward enough so that you can rotate it to get to cover. There is no gasket you use RTV to reseal it, I used the Ultra Grey Permatex stuff.
I have not done it this way, I just dropped the damn thing because I was switching out the whole innards of mine, but it should work.