I would say with the tranny is easier, but I had to pull mine without the tranny due to my garage clearance. The only hard part is lining the motor up with the tranny on install. I went to the hardware store and got bolts that were about 1"-1.5" longer than the bellhousing bolts, grinded the heads off and shaped them like a bullet. Put 2 of these on the motor and it will pretty much self align. Helped a ton on install and keeps you from worring about damaging the input shaft.
Cheers!