I cut through the other post on the drive side, and it was made incredibly easier by using some 3-in-1 oil. At the time I thought that three in one did an absurd amount of work, reducing the cutting time by 30-odd minutes, but I also found out just this night that the post was actually skinnier than the first one I cut through, and had thinner walls. Oh well. Two more to go.
Copious amounts of Oil.
Drive side done!
I apologize for not posting in two weeks, I meant to post this the day that it occurred, but I've been having technical issues/am just getting my act together now.