Re: Dropping Front Dif?
That's the one I'm thinking of.
I am pretty sure once the front drive shaft and all of the diff mounting bolts are removed, the entire differential will drop down and you will be able to rotate it around to get access to the top bushing.
I'd wait until someone else confirms it (I haven't done this job) before running out and tearing things down, but I think a couple of members have tackled this job that way.
You'll of course want a transmission jack to hold the diff in place while taking out the mounting bolts, and think about the order to remove them.