As jp mentioned you need clearance at the rack. If you drop just the passenger side there's enough room for the replacement. You need a serious torque wrench though, as the main crossmember bolts need to go to 177#. It's a good time to check bearings and replace rod bolts, while you're looking at them. Good Luck.
Also, the AC compressor bolts to the pan, so those bolts have to be removed, though the compressor itself can remain in place. If you're going to the C6 pan, the pressed plug in the block will have to be removed for the new dipstick location.