Replacing rear seal w/engine in car?

I changed the rear main seal in the vehicle on a 318 once.... but it was in a 78 d200. The pan was a pain to get off and on and I had to loosen and then retorque all the main bolts. I doubt you could take the pan off while its still in the car without undoing the mounts anyway, might as well pull it out. For sure check the intake gasket and oil sender first, look at the plug behind the cam too