I just did this a while back to replace the rear main seal. It was a huge PIA. Even after rotating it so the differential was pointing up, I couldn't get it to drop. After hours of futzing with it and then resting my arms, the key for me was to raise the car higher so i could lower the engine more (until alternator hits radiator). Next is to tilt the end of the tranny up to get the bottom of bell housing passed the flywheel. Once the bottom of bell housing is free, you can lift tranny straight up to free the differential from the flywheel.
I've read a lot of people talk about rotating the tranny, but to free the bottom first then lift diff. up and over flywheel was the key for me. I hope this helps the next person trying to do this.
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