My 85 4X4 all i had to do was undo the nuts on the motor mounts that go to the frame, and jack it up enough to lay 2X4 block flat on each side. I didn't have to disconect anything. and the pan had TONS of room. I could of done it without jacking it up but my big ole' Craftsman Torque Wrench is like over 2ft long and it wouldn't fit.

It's easy. With the I6 you can also do an Inframe overhaul if you don't have a crane.
I was stupid and didn't get the 1 piece. That stupid rear piece kept falling into the pan. So when i did the mains and rods i learned to put some RTV in the groove on the block put the rear piece in place and RTV'd the other pieces of the gasket to the OilPan. then at where they met put some RTV.

Took about 2hrs to do it right.

DT